I have an auction up for an SNES cartridge containing both Dr. Mario and Tetris. There's about a day or so left, and 50% off shipping for CAGers.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=8179079262
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=8179079262