I've got a few things up on the 'bay this week:
http://search.ebay.com/_W0QQsassZtvideogames
Some highlights -
Sonic drift 2 for Game Gear
http://cgi.ebay.com/ws/eBayISAPI.dll...sPageName=WDVW
Tetris Plus! for Game Boy
http://cgi.ebay.com/ws/eBayISAPI.dll...sPageName=WDVW
SNES system
http://cgi.ebay.com/ws/eBayISAPI.dll...sPageName=WDVW