MacBook Pro (2015 13 inches) screen is broken

No.

Unfortunately this 2015 laptop is now considered "Vintage" so an official Apple repair is only available as long as the necessary parts are still available.

No, genuine Apple parts are not available from Apple at discount.

In addition, the number of assemblies used in Apple products has been reduced in recent years, yielding fewer parts of higher complexity, but one part covers multiple repairs. so the screen assembly is more complex and more expensive.

However, your Mac is not new, and by this time some Macs of the same model may have died due to other reasons, such as drinking a glass of water through the keyboard. Third-party servicer may be able to provide a good used display harvested from another Mac of the same model.