When we conducted our daily perusal of poppa site Joystiq, we were intrigued by the above image. A DS cartridge case that allows one to hold up to 4 DS game cartridges and one GBA game cartridge. The case is Shogakukan's Hyper Carrying Case, available to Japanese consumers for a cool ¥480 (or roughly $4 USD). Do not be fooled by the wonderful graphic on the front of the case though. Inside there are no Mega Man games.
Nintendo Game Boy 1st-gen
Nintendo Game Boy Advance