sk3nn1x yeah, that's probably because the phone isn't worth fixing with OEM parts unless you're Google certified (they give you huge discounts on the parts). A display replacement with an OEM screen would be around 270-290€ if you can't get the discounts - and that's more than the phone is worth nowadays.
My advice: go to the repair shop, show them that the fingerprint reader isn't working and demand a fix under warranty. If that shop is in the realm of professionalism, they will offer at least a 3 month warranty on their repairs.