Greetings, wondering where we could purchase a fuel rail with injectors for the vehicle indicated below. New or good used. The GM dealership is asking about $1,000 for the fuel rail alone.

We are looking for a more affordable option, if there is one.
2002 Workhorse P32 with a 8.1L Vortec
VIN 5B4JP57G423340856
Thank you for your insight.