HELP! Need 8 3/4 Rear end for 70' Duster

Have prices really dropped that far? Last year I needed one and couldn't find one anywhere. I had 2 junk yards tell me that if they did have one they would want no less then $1500.00. I finally sucked it up and paid $1800.00 for a Strange Dana 60.
I do have an A-body 8-3/4's, complete drum to drum, but I don't think I would let it go for less then $500.00.

Denver, Co.