One sold here complete and original (maybe a one-owner?) that was used on a farm for $375. One of my riding buddies got it and is in the process of bringing it back to life. It was a Craigslist find.
Like MotoRandy123 said run an ad saying you're looking for Honda Trail 90/110's, Trail 55's, Honda Cubs, Chinese clones or whatever you think you might want to mess with. The results can be amazing.