I have 2 World of Warcraft: Cataclysm beta keys which aren't bound to any battle.net account yet.
This means they don't come with any other game. But no game is required to play the beta either.
You're free to add it to your or a new battle.net account.
I just mail you the key.
Open to money offers.
contact me @ [email protected] since my pm box is always full