I snagged a Genesis model 2 with a six button pad, a three button pad, an SG-6 Fighter Stick, NBA Jam, Tecmo Super Baseball, and Contra Hard Corps for $10.
I also went to local used game store and picked up Batman Returns, Robocop vs. Terminator, Ninja Turtles Hyperstone, Mortal Kombat 1, and The Immortal, so for not much cash I have a nice little Genesis collection going. I also ordered a few cables because I've had a 32X unit and no Genesis to plug it into for years... So I'll be hitting up the used store to snag a couple of not very good 32X games soon too 
Great deal, except any controllers plugged into the player two side act as if right on the d-pad is always depressed, which makes it a little difficult to play two player. I've disassembled the whole thing, and the player-two side acts the same out of the case as it does in the case. All the solder joints look ok, but I know that doesn't necessarily mean anything. Any tips on where to look first to fix this?
Great deal, except any controllers plugged into the player two side act as if right on the d-pad is always depressed, which makes it a little difficult to play two player. I've disassembled the whole thing, and the player-two side acts the same out of the case as it does in the case. All the solder joints look ok, but I know that doesn't necessarily mean anything. Any tips on where to look first to fix this?