I have a working, original Atari 2600 (circa 1979) with tons of games, Pac-Man, Pitfall, Defender, Missile Command, etc.
I was going to put it on Ebay, but I wanted to try here first.
Screw EBay, put it on BitMit!
Use something like
this auction to figure out what someone might pay. Then do a fixed price listing on BitMit until it sells.