My town has an abandon bike auction every few weeks so they much cut bikes out that have been left for a while. I have never attended the auction, but I have heard everything from its a great place to get cheap bikes and that it has overpriced stuff and junk. My guess is that its crawling with flippers and it might not be worth going anymore anyway.

My college picked up all the abandoned bike at eh end of the semester when the need to move bike racks around or paint them. The just put them in their metal pile to recycle, but I have snagged a few of them and fixed them up sometimes for students that needed something to ride.