http://cgi.ebay.com/Atari-7800-ProSy...em250219190339
That auction has 5 2600 games, a 7800, and a pair of Prolines based on the picture. The sellers starting price is for $400.00. The seller doesn't have a rating.
Here is the sellers Description of the auction: Atari 7800 ProSystem. 5 games Ms. PacMan, Qbert, Space Invaders, Crystal Castles & Video Olympics. 2 paddles.
Needs cable.
I think it would difficult to outdo this auction of ebay insanity. All the games in the auction are common games. I would understand the if the system was sold with a lot games or having more then 2 2600 games in the auction that have a rarity higher then a 7 in rating.