Here's a list of Atari 2600, 5200, 8-bit and C64 games I'm looking for. Games marked with an asterisk are ones I'd like to have sooner rather than later, if you catch my drift.
2600
Activision Decathlon
Alien
Burgertime (M-Network version)
*Beamrider
Dragonfire
Frostbite
Montezuma's Revenge
Off the Wall
Taz
5200
Beamrider
*The Dreadnaught Factor
Gremlins
Gyruss
Mountain King
Pengo
*Pitfall II
*Robotron 2084
Wizard of Wor
Zone Ranger
7800
Alien Brigade
Basketbrawl
Kung-Fu Master
*Midnight Mutants
Atari 8-bit
Ace of Aces
Activision Decathlon
Airball
Archon
*Ballblazer
*Beamrider
Blue Max
Caverns of Mars
Choplifter (Broderbund version)
Crime Buster
Crossbow
Dark Chambers
Deluxe Invaders
*Donkey Kong
Fight Night
*Final Legacy
H.E.R.O.
*Jungle Hunt
K-Razy Shootout
Kaboom
Karateka
Mario Bros.
Megamania
Midnight Magic
Pitfall II
*Rescue on Fractalus
Spy Hunter
*Star Raiders II
Track & Field
Wizard of Wor
Zaxxon
Zone Ranger
C64
Avenger
Battlezone
Centipede
Donkey Kong
Gyruss
Lazarian
Omega Race
Robotron 2084
Solar Fox
Star Ranger
Wizard of Wor
I prefer all games to be loose and in good condition.