I picked up a Yamaha M-60 amp and C-60 preamp on CL for $60 this week. I actually got a Pioneer CD player, JVC tape deck, and Technics tuner too (no extra charge). The preamp has a few cosmetic issues but nothing crazy. The amp was dirty as hell but cleaned up well. I think it may have been in a garage or potentially a heavy smoker's house. Here are some pics of the amp before and after cleanup.