It's been a terribly long time since I've done any Flea Marketing- but I do remember finding a Genesis with the hookups for maybe 10 dollars as a younger child. Places like Goodwill are pretty good, though. I got three NES games and a PSX game for about six dollars- flea markets and Slackers stores would charge maybe 50 dollars for all the games. And, they all work and are in nice shape. You can also try and bargain with them, but don't go too low.