Honestly, I would give up on finding one with a rear locker and just concentrate on the manual tranny. Add the locker later. I believe you can get brand new elocker thirds straight from toyota for $800 (maybe even $600...I forget now). I think you can order them up to 4.56s.

The minor housing mods can be done at our super duper secret mega Xtreme fabrication facility over in oakdale. It would only cost you some beers, energy drinks and soda.