Rear change for BBP - What would you do?

As for the 8 3/4 B-Rear that I have, I don't have a chunk, just the housing and axles. I would need to get a chunk and add brakes.

I would love to find a good 8 1/4 that was read to bolt in and run that someone had upgraded to an 8 3/4.

What is a reasonalbe price for an 8 1/4 ready to run with brakes?