5star i just called my friends who i worked with at gamestop. You can get in the beta by reserving the game. Just give them your email when you reserve and ur in. I think id rather spend 5 bucks to reserve the game then buy a more expensive item to trade with you. Sorry to rain on your parade.
1) Treyarch SPECIFICALLY STATED that beta code transactions are NOT allowed.
2) You seriously expect someone to give you a $50 game for a FREE beta code that will become redundant in a month?
They made a bad game so go against what they say for THEIR beta? Remember, they don't actually have to distro keys like this. A lot of games are only beta tested by professionals and don't even get seen till their on the shelf.