I suggest www.gamegenie.com for most of your codes...it's not owned by galoob but they do have a lot of codes on there -unfortunately i don't see captain comic codes there though ... someone help the dude out
HERE is a link to get you started. Just do a game search on the right hand side for any game. Cheats and codes are at the very bottom of the game entry.
~~NGD
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Proud replier of post #1000 in the infamous Joel thread