My friend has one he was selling for $500, 8.5 with 3.42, just not a posi. I could check if he still has it. As of wed he did, but I know someone else was asking about one as well.
I have a Race prepped 8.5 for sale, 33 spline axles, spool, c clip eliminators and 3.73 gears drum to drum with big cylinders ready to bolt in. $1100.00 shipped.