If you have any connections with local schools try searching around. Usually they've gotten rid of all the unwanted Mac stuff by now but you can get really lucky. I got around 10 Macs (from a original LC to a G3 desktop) and associated paraphernalia (lots of KBs/mice/random Apple cables) from my old middle school (around 2008 or so). It was free but it took some time to get them from the school because of data concerns and all.