Some of you may have already found this EBay store
Mel-Co This guy lists return and waranty engines that sears wants to unload. They are mostly v twin briggs engines ELS Inteks, Regular Inteks and some vanguards. The catch is that you don't know what is wrong with them until you get them. Could be a carb that needs tweaking or bad rings or in some instances a thrown rod (rare from what I understand). I just received a 44 cu inch Intek that I put on a test stand and started right up. It had bad rings. But for the $51 I spent it was worth it. Most of us will replace rods and pistons and flywheels anyhow. It is a good source for the basic engine on which to build a good motor. Definitly worth looking at. Just thought I'd pass it on to you guys. Here is the address for these guys.
http://stores.ebay.com/Mel-co