ZIP 78203 broadband research · San Antonio, Texas Availability varies by exact service address
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San Antonio ZIP 78203

78203 Internet Providers

Broadband in 78203 is shaped by a compact mix of established East Side neighborhoods, older housing, multifamily properties, downtown-adjacent redevelopment and commercial corridors. Current ZIP-level records show AT&T fiber and Spectrum cable as the principal wired choices, with Verizon and T-Mobile fixed wireless adding substantial wireless competition.

● ZIP-level research identifies the local provider market. It does not establish that every home, apartment, historic property or commercial building can order every provider listed on this page.

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ZIP-code results describe the local service market. Provider eligibility, available technology, speeds and pricing can differ at individual addresses, apartment buildings, historic properties and commercial conversions.
Location
San Antonio, Texas · 78203
Main technologies
Fiber · Cable · 5G · Satellite
Local evidence
Provider + FCC-derived records
Research standard
Address verification required

What the 78203 broadband evidence shows

78203 has a more concentrated wired broadband market than many suburban San Antonio ZIP codes. Spectrum's cable network covers most of the ZIP in current ZIP-level records, while AT&T fiber is the principal high-capacity fiber option. Fixed wireless is also unusually relevant because current records show substantial Verizon and T-Mobile coverage.

Fiber

AT&T is the major fiber network to investigate

Current 78203 broadband records identify AT&T fiber as a major technology in the ZIP. AT&T's current San Antonio information advertises fiber speeds up to 5 Gbps where available. The ZIP-level evidence is meaningful, but the exact property still determines whether fiber can be ordered.

Cable

Spectrum is the dominant cable footprint

Current ZIP-level datasets report Spectrum cable coverage across nearly the entire 78203 ZIP. Spectrum also now identifies San Antonio as a market with a fiber network, so the provider name alone should not be used to infer the technology reaching an individual property.

78203 provider comparison

The table separates provider evidence reported for the ZIP from address-level ordering information. FCC-derived availability data are useful for identifying the local broadband market, while the FCC's location-level map and provider address tools are needed to determine what can actually be ordered at a particular property.

Provider Technology 78203 evidence Advertised maximum Verify
AT&T Fiber
Major wired provider 		Fiber Current ZIP-level records identify AT&T fiber throughout a substantial portion of 78203. AT&T also identifies San Antonio as a fiber market. Up to 5 Gbps where available
Check AT&T
Spectrum
Very large ZIP footprint 		Cable; fiber in select San Antonio locations Current 78203 records report Spectrum cable across approximately 96% or more of the ZIP depending on the dataset and reporting vintage. Spectrum also identifies San Antonio as a fiber market. Up to 2 Gbps in applicable markets
Check Spectrum
Verizon 5G Home Internet
Large fixed-wireless footprint 		5G fixed wireless Current ZIP-level datasets report Verizon fixed-wireless service across a large portion of 78203. Plan and location dependent
Check Verizon
T-Mobile 5G Home Internet
Large fixed-wireless footprint 		5G fixed wireless Current ZIP-level records report extensive T-Mobile fixed-wireless availability in 78203. Residential eligibility remains dependent on the exact address and network capacity. Plan and location dependent
Check T-Mobile
Astound Broadband
Small footprint 		Cable / fiber depending on location Current ZIP-level datasets identify only a small Astound footprint in 78203. One dataset reports roughly 5% cable and 5% fiber, while another current source reports a substantially smaller residential footprint. This should be treated as a property-level possibility, not a ZIP-wide service. Up to 2 Gbps where available Exact address and technology
Alamo Broadband
Limited fixed wireless 		Fixed wireless Current 78203 records identify Alamo Broadband at a smaller share of locations. The provider is therefore relevant to particular properties but should not be presented as a universal ZIP option. Up to 1 Gbps where available Exact service address
EarthLink
Secondary wireless evidence 		Fixed wireless / legacy technologies Current ZIP-level records identify EarthLink through fixed-wireless and other network arrangements. Because EarthLink can resell or market service over underlying networks, the actual access technology should be confirmed at the address. Technology and location dependent Exact address and network type
Satellite providers
Broad geographic option 		Satellite Satellite broadband is geographically relevant throughout 78203 because it does not depend on the same neighborhood fiber or cable plant used by terrestrial providers. Provider and plan dependent Equipment, sky view, latency and plan terms
ZIP-level interpretation: 78203 has a strong wired broadband base, led by Spectrum cable and AT&T fiber, with fixed wireless providing substantial additional competition. Smaller providers appear in the data but should be treated as address-specific possibilities. The FCC's National Broadband Map reports provider availability at individual locations, so ZIP-level provider listings should not be treated as ordering results.

Internet providers serving the 78203 market

The provider descriptions below focus on networks with meaningful current evidence in ZIP 78203. Large local footprints are separated from smaller or more conditional service possibilities.

AT&T Fiber

Fiber Major local technology Up to 5 Gbps

AT&T is the most important fiber network to investigate in 78203. Current ZIP-level records identify AT&T fiber as a major residential technology, while AT&T's current San Antonio service information confirms that fiber is available in parts of the city with advertised speeds up to 5 Gbps.

  • Fiber is the relevant AT&T technology to check at a 78203 property where available.
  • The presence of AT&T fiber in ZIP-level records does not establish service to every building.
  • Older homes and multifamily properties should be checked by exact address rather than nearby coverage.
Local evidence: Current 78203 provider records identify AT&T fiber as a substantial wired network. AT&T's San Antonio page currently advertises fiber speeds up to 5 Gbps where available. The address checker remains the final test for serviceability.

Spectrum

Cable Very large ZIP footprint Fiber in select areas

Spectrum has the broadest reported cable footprint in 78203. Current ZIP-level data indicate that Spectrum cable reaches nearly the entire ZIP, making it the principal cable network against which AT&T Fiber and fixed wireless should be compared.

  • Spectrum cable is reported across approximately 96% or more of the ZIP in current datasets.
  • Spectrum separately identifies San Antonio as a market with a fiber network.
  • The technology and available plan should be confirmed for the individual property.
Local evidence: A current 78203 dataset reports approximately 99.72% Spectrum cable availability based on its FCC-derived coverage layer, while another current provider source reports approximately 96.2%. The difference illustrates why coverage percentages should be treated as estimates, not address-level guarantees.

Verizon 5G Home Internet

5G fixed wireless Large reported footprint Address dependent

Verizon is a significant wireless competitor in 78203. Current ZIP-level records report a large fixed-wireless footprint, making Verizon worth checking even at properties where Spectrum cable is readily available.

  • Wireless eligibility is different from general mobile coverage.
  • Capacity and signal conditions can produce different results at nearby properties.
  • Apartment construction and indoor signal conditions can affect practical performance.
Local evidence: Current ZIP-level broadband records report Verizon fixed wireless across a substantial portion of 78203. Verizon's current San Antonio home-internet information directs customers to check eligibility by ZIP code and exact address.

T-Mobile 5G Home Internet

5G fixed wireless Large reported footprint Capacity-dependent

T-Mobile Home Internet is another meaningful fixed-wireless option in 78203. Current ZIP-level records report extensive T-Mobile fixed wireless coverage. The practical significance is that a household can have a wireless alternative even when the wired market is dominated by one cable network and one fiber network.

  • Service uses T-Mobile's wireless network rather than a dedicated cable or fiber line.
  • Eligibility can change with local network capacity.
  • Mobile coverage maps should not be treated as proof of Home Internet eligibility.
Local evidence: Current 78203 broadband records report T-Mobile fixed-wireless availability across most of the ZIP. The final residential service decision must come from T-Mobile's address-level availability system.

Astound Broadband

Small local footprint Cable / fiber Verify address

Astound Broadband appears in 78203 broadband records but at a much smaller footprint than Spectrum or AT&T. Current datasets differ materially in how much coverage they attribute to Astound, which is another reason to avoid presenting the provider as a ZIP-wide option.

  • Some current records identify a small Astound cable footprint.
  • Other records identify limited Astound fiber service.
  • The actual network and serviceability should be checked directly at the property.
Evidence standard: Astound is included because current ZIP-level records identify service in 78203. Its smaller and inconsistent reported footprint is treated as a property-specific possibility rather than broad ZIP coverage.

Alamo Broadband

Local fixed wireless Smaller footprint Verify address

Alamo Broadband appears in current 78203 provider records as a smaller fixed-wireless network. It is relevant to the local market because fixed wireless can reach properties independently of the neighborhood cable plant, but its reported coverage is far below the major wired networks.

  • Coverage is limited compared with Spectrum and AT&T.
  • Fixed-wireless eligibility depends on the local network and property.
  • It should be checked only after establishing whether the address falls inside the reported footprint.
Evidence standard: Current ZIP-level data identify Alamo Broadband at a smaller share of 78203 locations. It is therefore included as a limited local provider, not a universal ZIP-wide choice.

EarthLink

Secondary provider Network-dependent Address verification

EarthLink appears in current 78203 provider datasets through multiple access technologies. Because EarthLink may market service over underlying networks rather than operate a single uniform last-mile network across the ZIP, the advertised provider name should not be treated as the network technology by itself.

  • Current records identify EarthLink through fixed wireless and other access arrangements.
  • The underlying network can affect speed, latency and service characteristics.
  • Exact-address verification is necessary before comparing EarthLink with fiber or cable.
Evidence standard: EarthLink is included as a secondary provider identified in current ZIP-level records. The actual access technology should be confirmed before using the provider as a direct fiber-versus-cable comparison.

Satellite providers

Satellite Broad geographic availability Different network model

Satellite broadband remains geographically relevant throughout 78203. It does not rely on the same local fiber, coaxial or fixed-wireless infrastructure as the primary terrestrial networks. In this ZIP, however, satellite is generally better understood as an independent technology category than as a substitute for the area's substantial wired competition.

  • Satellite availability is less dependent on local cable or fiber construction.
  • Latency and equipment requirements differ materially from terrestrial broadband.
  • Plan performance and pricing should be checked directly with the provider.
Evidence standard: Satellite is included as a geographically broad technology category, not as evidence that a particular satellite provider is the preferred option for a 78203 household.

78203 internet speed guide

The local market ranges from fixed-wireless connections to multi-gigabit fiber. Because 78203 contains older homes, apartments, commercial conversions and newer redevelopment, the useful comparison is the speed and technology actually available at the property rather than the maximum advertised for the ZIP.

100–300

Mbps

Suitable for ordinary browsing, video calls, streaming and moderate household use when the connection is stable.

500 Mbps

Mbps

Useful for households with several simultaneous users, streaming devices and larger downloads.

1–2 Gbps

High-capacity plans

Relevant for larger households and heavy downloads where the local wired network supports the tier.

3–5 Gbps

Multi-gig fiber

AT&T advertises fiber speeds up to 5 Gbps in San Antonio where available. The address and network equipment must support the tier.

Do not compare download speed alone. A 78203 household comparing AT&T Fiber, Spectrum and fixed wireless should also examine upload capacity, latency, congestion, equipment, installation, service terms and the technology actually reaching the property.

Connection types in 78203

The ZIP's network mix is particularly important because its housing stock includes older single-family homes, historic properties, apartments, mixed-use buildings and redevelopment near Downtown San Antonio.

Fiber

AT&T is the principal fiber network identified in current 78203 records. Spectrum also identifies San Antonio as a market with fiber service in some locations. Fiber availability should be checked at the property rather than assumed from ZIP-wide coverage.

Cable

Spectrum has an exceptionally large reported cable footprint in 78203. This makes cable the main wired alternative to AT&T fiber for many properties, subject to the exact service address.

5G / fixed wireless

Verizon and T-Mobile are significant fixed-wireless alternatives in current ZIP-level records. Their service can be useful where a property does not receive the same wired options as nearby addresses.

Satellite

Satellite is geographically available independent of neighborhood cable and fiber construction. Its latency and equipment requirements differ materially from the terrestrial options common in 78203.

What is different about broadband in 78203?

78203 sits immediately east of San Antonio's central business district and includes portions of the historic East Side and Downtown-area planning geography. The ZIP is compact, but its buildings are not uniform: older houses, historic districts, apartments, commercial properties and redevelopment sites coexist within a small area.

1

Spectrum has an unusually broad cable footprint in this ZIP

Current ZIP-level records place Spectrum cable at roughly 96% to nearly 100% of 78203 depending on the dataset and reporting vintage. That makes Spectrum the most consistently reported wired network in the ZIP, but the difference between datasets also shows why a coverage percentage should not be interpreted as a guarantee for every individual building.

2

AT&T fiber creates a major wired alternative to cable

Current 78203 records identify AT&T fiber as a substantial local technology, while AT&T's San Antonio service information confirms fiber availability in parts of the city with speeds up to 5 Gbps. This gives 78203 a materially different wired comparison from ZIP codes where cable is the only major high-capacity terrestrial option.

3

Fixed wireless is not merely a rural fallback

Current 78203 datasets report large Verizon and T-Mobile fixed-wireless footprints. In a compact urban ZIP, this is significant because wireless service can provide a separate access path when a building's wired choices are constrained by infrastructure or property-specific conditions.

4

Older housing changes the practical availability question

Dignowity Hill and surrounding East Side areas contain substantial older housing, including buildings constructed during the late nineteenth and early twentieth centuries. A property can therefore have different interior wiring and installation considerations from newer construction elsewhere in San Antonio. The provider serving the street is not necessarily the same as the service that can be activated inside a particular structure.

5

Historic districts and redevelopment create mixed building conditions

Dignowity Hill is a City-designated historic district with a predominantly older architectural fabric, while the broader Downtown Regional Center includes Dignowity Hill, Denver Heights and other neighborhoods experiencing continued redevelopment. Renovated historic homes, new infill, apartments and mixed-use buildings can therefore sit within the same ZIP without sharing identical broadband infrastructure.

6

Multifamily and urban redevelopment require building-level checks

Apartments and converted or mixed-use properties can have provider agreements, existing wiring, centralized equipment or installation limitations that do not apply to a detached home next door. In 78203, where redevelopment and multifamily housing occur alongside older residential blocks, the building address is more useful than a nearby street address for determining the actual provider list.

78203 local broadband findings

These findings describe what the available evidence means for residents rather than simply repeating a list of provider names.

Finding Evidence What it means for a 78203 address
AT&T fiber Current ZIP-level records identify substantial AT&T fiber coverage; AT&T advertises up to 5 Gbps in San Antonio where available. AT&T should be checked as a fiber provider rather than treated only as a legacy copper or DSL network.
Spectrum cable Current ZIP-level records report Spectrum cable across nearly the entire ZIP. Spectrum is the principal cable competitor, but the exact address determines the service and available technology.
Spectrum fiber Spectrum currently identifies San Antonio as a market with a fiber broadband network. The Spectrum brand alone should not be used to infer that every address receives coaxial service.
Verizon fixed wireless Current 78203 records report Verizon fixed-wireless coverage across a large share of the ZIP. Verizon should be checked separately from wired providers rather than treated as equivalent to general mobile coverage.
T-Mobile fixed wireless Current ZIP-level records report extensive T-Mobile fixed-wireless coverage. 5G Home Internet is a meaningful alternative when the property's wired choices are limited.
Astound Current datasets identify a small Astound cable/fiber footprint. Astound should be treated as a limited property-specific possibility, not a ZIP-wide provider.
Alamo Broadband Current ZIP-level records identify a smaller fixed-wireless footprint. The provider is relevant to some properties but is not comparable to Spectrum's ZIP-wide cable footprint.
Older housing Dignowity Hill and other East Side areas include substantial older housing and historic buildings. Interior wiring, installation access and building condition can affect the practical service result.
Redevelopment and multifamily housing The Downtown/East Side planning area includes historic neighborhoods, apartments, infill and redevelopment. Building-level provider verification is more useful than assuming every property on a block has the same network options.

Areas and development patterns inside 78203

These locations help explain why broadband infrastructure can differ inside the ZIP. They are geographic reference points, not substitutes for an address-level provider check.

Dignowity Hill A historic neighborhood immediately east of Downtown. The City of San Antonio identifies the district as an established historic area, with much of its housing dating from the late nineteenth and early twentieth centuries. Older structures make building-level service verification particularly relevant.
Denver Heights An East Side residential area included in San Antonio's Downtown planning geography. Its older residential fabric and continuing reinvestment create a mix of established homes, renovated properties and newer development.
East Downtown / Downtown edge Properties near the downtown core can combine apartments, commercial buildings, renovated structures and newer residential development. Provider availability can therefore vary materially by building.
St. Paul Square area The historic St. Paul Square area sits within the broader Downtown and East Side planning context. Older commercial structures and redevelopment make the serviceable building address more useful than ZIP-level assumptions.
Arena / event district edge The eastern side of 78203 is influenced by major event and entertainment infrastructure around the Alamodome and Frost Bank Center area. Residential and rental properties in this part of the ZIP can have different building types and network arrangements.
Hays Street / East Side corridors Established East Side corridors connect older residential areas with commercial and redevelopment activity. Changes in building use and property redevelopment can make exact-address broadband verification more important than a neighborhood-wide provider assumption.
Why this matters: 78203 is compact but not infrastructure-uniform. Historic houses, renovated properties, apartments, mixed-use buildings and newer infill can have different wiring and installation conditions. A provider reported across the ZIP should therefore be treated as a research lead until the exact property is checked.

Nearby San Antonio ZIP-code broadband guides

Nearby ZIP codes can have different network footprints. Use them as separate research areas rather than transferring 78203 availability assumptions across ZIP boundaries.

78201 Central San Antonio broadband guide 78202 East / central San Antonio broadband guide 78204 Downtown / Southtown-area broadband guide 78210 East / South San Antonio broadband guide

How to verify internet service at a 78203 address

The correct sequence is to use ZIP-level research to identify relevant networks, then verify the exact property with each provider before comparing plans.

1. Check the wired networks first

  • Check AT&T for fiber availability.
  • Check Spectrum for cable or fiber service at the property.
  • Check Astound if the address appears to be inside its limited footprint.
  • Check smaller local networks where current data identify service.

2. Compare fixed wireless separately

  • Check T-Mobile 5G Home Internet at the exact service address.
  • Check Verizon 5G Home Internet separately.
  • Check Alamo Broadband where its local footprint applies.
  • Do not infer home eligibility from general mobile coverage.

3. Check the property type

  • Determine whether the property is a detached home, apartment, condominium or mixed-use building.
  • For multifamily buildings, confirm which providers actually wire the building.
  • For older or historic properties, verify existing coaxial or fiber infrastructure.
  • Do not assume a neighboring address has the same choices.

4. Treat ZIP-level data as a research layer

FCC-derived datasets are useful for understanding the broadband market around 78203. The FCC National Broadband Map can then be used to examine provider availability at a specific location. Provider address checkers remain the appropriate source for live ordering eligibility, current plan availability and current pricing.

What to compare before choosing a 78203 connection

The local network mix makes technology, upload performance and property-level availability more useful comparison points than a single advertised download number.

Fiber versus cable

Check upload capacity

AT&T Fiber can provide much higher upload capacity than traditional cable tiers where available. That difference can matter for cloud backups, remote work, large file transfers and other upload-heavy activity.

Wireless competition

Check both Verizon and T-Mobile

Current 78203 records show substantial fixed-wireless footprints for both providers. Eligibility can differ between nearby properties, so one provider's wireless availability should not be treated as proof that the other will qualify.

Older and multifamily properties

Check building-level infrastructure

Historic homes, apartments and mixed-use buildings can have different wiring and installation conditions. In 78203, the building address can therefore be more informative than the ZIP-wide provider list.

Check the exact 78203 address

ZIP-level research identifies the local market. Provider address tools determine what can actually be ordered at the property.

Check Availability

Sources and methodology

This page gives greater weight to official provider information for provider-specific service claims and uses FCC Broadband Data Collection-derived datasets as a secondary ZIP-level coverage layer. Local San Antonio planning and digital-connectivity information is used to explain why property-level conditions matter in 78203.

Official provider and FCC sources

  • AT&T's current San Antonio residential and fiber information, which confirms AT&T Fiber availability in parts of San Antonio and advertises speeds up to 5 Gbps where available.
  • Spectrum's current San Antonio information, which identifies both its conventional Internet network and its fiber broadband network in the San Antonio market.
  • Verizon's current San Antonio home-internet information, which directs customers to address-level availability for 5G Home Internet.
  • The FCC National Broadband Map and Broadband Data Collection methodology were used as the framework for interpreting provider-reported location-level availability.

78203 and San Antonio local evidence

  • Current ZIP-level broadband datasets were reviewed for 78203 provider and technology patterns, including Spectrum cable, AT&T fiber, Verizon fixed wireless, T-Mobile fixed wireless and smaller provider footprints.
  • City of San Antonio digital-connectivity information documents the City's broader effort to improve reliable broadband access in underserved locations and its AT&T fiber expansion program.
  • San Antonio's Downtown and East Side planning information was used to identify the historic, residential and redevelopment context affecting broadband infrastructure in 78203.
  • City historic-preservation information for Dignowity Hill was used to distinguish the ZIP's older building stock from newer redevelopment.
Research limitation: A ZIP code is a geographic mailing boundary, not a broadband service boundary. Provider coverage can differ by street, census block, building, apartment unit and serviceable address. FCC availability information is provider-reported and is not a substitute for a provider's live ordering system. Coverage percentages from secondary datasets can also differ because of reporting dates and methodology.

78203 internet provider FAQ

Answers are based on the provider information and ZIP-specific broadband evidence reviewed for this guide.

What internet providers serve ZIP code 78203?
Current ZIP-level evidence identifies AT&T and Spectrum as the principal wired providers in 78203, with Verizon and T-Mobile among the major fixed-wireless alternatives. Smaller reported footprints include Astound Broadband and Alamo Broadband, while EarthLink and satellite services also appear as secondary or geographically broad options. The exact provider list for a property should be confirmed using address-level availability tools.
Is AT&T Fiber available in 78203?
Current 78203 broadband records identify AT&T fiber as a major local technology. AT&T's current San Antonio information also confirms that fiber is available in parts of the city, with speeds up to 5 Gbps where available. Exact eligibility still has to be confirmed at the property.
Does Spectrum serve 78203?
Yes. Current ZIP-level broadband records report a very substantial Spectrum cable footprint in 78203. Spectrum also identifies San Antonio as a market with a fiber network in some locations. The exact technology and plan available at a specific property should be confirmed directly with Spectrum.
Is Verizon 5G Home Internet available in 78203?
Current ZIP-level broadband datasets report substantial Verizon fixed-wireless coverage in 78203. That establishes Verizon as a relevant local broadband alternative, but it does not establish live eligibility at every address. Verizon's current address checker should be used before treating the service as available.
Is T-Mobile 5G Home Internet available in 78203?
Current ZIP-level broadband records report extensive T-Mobile fixed-wireless coverage in 78203. Residential eligibility can vary by address and network capacity, so T-Mobile's live availability check is required.
Does Astound Broadband serve 78203?
Astound appears in current 78203 broadband datasets, but its reported footprint is much smaller than Spectrum or AT&T. Different datasets also report different coverage estimates. Astound should therefore be treated as a limited property-specific possibility until the exact address is checked.
Does Alamo Broadband serve 78203?
Current ZIP-level records identify Alamo Broadband at a smaller share of 78203 locations. It is relevant to some properties as a local fixed-wireless option, but it should not be interpreted as a ZIP-wide provider.
Can two nearby homes in 78203 have different providers?
Yes. Wired networks can stop at different property or development boundaries, while wireless eligibility can depend on capacity and signal conditions. The difference can be particularly important in 78203 because the ZIP includes older houses, historic properties, apartments, mixed-use buildings and newer redevelopment.
Why does 78203 have so many different types of broadband?
78203 is a compact urban ZIP close to Downtown San Antonio but contains several different development patterns. Established residential blocks, historic buildings, multifamily properties, commercial structures and newer infill can have different infrastructure. Spectrum cable and AT&T fiber form the principal wired comparison, while fixed wireless adds another access path.
Is the fastest advertised speed necessarily the best connection?
Not necessarily. Download speed is only one measure. Upload capacity, latency, congestion, equipment, installation requirements, pricing after promotional periods and the actual network technology at the property should also be considered.
Why does this page use ZIP-level data instead of claiming exact coverage?
ZIP-level datasets are useful for identifying the broadband market around 78203, but provider networks do not follow ZIP boundaries. The FCC National Broadband Map provides location-level information because service can differ from one building or address to another. Treating a ZIP-wide percentage as proof of service at every address would overstate what the data establish.
Availability disclaimer: Provider names, technologies, advertised speeds, pricing and availability can change. ZIP-level broadband information does not guarantee service at an individual address. Apartment buildings, historic properties, subdivisions, mixed-use buildings and individual properties may have different network infrastructure. Always confirm service, technology, speed, equipment requirements and current pricing directly with the provider before ordering.
Check 78203 Availability