Keep your eye on FakeBook Marketplace and Cracklist- not just for the motor itself, but for entire vehicles (trucks, vans, Durangos, Jeep GCs, etc.) that might have a blown transmission, have been hit, are rusted beyond saving (well, maybe not in Phoenix...), and can sometime be picked up whole cheaper than just the engine can be found elsewhere. Take what you need, part out the rest, scrap the carcass, and you might just break even or even turn a slight profit on the whole deal.