7 1/4 to 8 3/4 rear end swap info needed

sounds good. I'm trying to tally up all the costs other than the obvious 8.75 rear end. what do you guys think is fair market value for a rebuilt 8.75 A-body rear end with sure grip already in it and rebuilt drum breaks? I'm sure prices vary depending on where you live and the supply and demand market, but i don't want to be ripped off over here in california. it seems that they range from $800-1200 where i am looking.