Take a look at this ebay seller:
http://search.ebay.nl/_W0QQgotopageZ...sortpropertyZ1
He's selling brand new Game Boy games for rediculous prices ($20). And the games come without case or manual.
What do you think? I've already emailed Nintendo America about this (Nintendo Europe doesn't have something to report this to).
Look like some guy that steals games or copies them...