What is the cost of iPad Pro screen replacement in US ?

Apple Authorized Service Provider (AASP) or Apple Store: If your iPad Pro is still under warranty or covered by AppleCare+, you may be eligible for a discounted or even free screen replacement, depending on the circumstances. If not, out-of-warranty screen replacements can cost anywhere from $299 to $649, depending on the model of iPad Pro.

Third-Party Repair Shops: Prices at third-party repair shops can vary widely, but they may offer more affordable options compared to Apple's official repair services. However, it's important to choose a reputable repair shop to ensure quality service and genuine replacement parts. Screen replacement costs at third-party repair shops typically range from $150 to $500, depending on the model and quality of the replacement screen.

AytonByrdl wrote:

Third-Party Repair Shops: Prices at third-party repair shops can vary widely, but they may offer more affordable options compared to Apple's official repair services. However, it's important to choose a reputable repair shop to ensure quality service and genuine replacement parts. Screen replacement costs at third-party repair shops typically range from $150 to $500, depending on the model and quality of the replacement screen.

Apple does not supply OEM components outside of its own network of Apple Authorised Service Providers (AASPs). As such, any components used by third-party repairers to fix an iPad with either be third-party components, or parts scavenged from other broken devices.

Many parts are "serialised" - and unless properly integrated using Apple Diagnostic software (not available to unapproved repairers), functionality can be lost. Common issues are disabled TouchID/FaceID.

Also be aware that repairs performed by anyone other than Apple or an AASP will forfeit all future support from Apple. System diagnostics will detect non-OEM components.

Check this Apple document

iPad Repair & Service - Apple Support