I won't go first, but I will use a MM or OMM at your expense.

MSN: [email protected]

All CoD4 CD-Keys around the world CANNOT be activated on Steam. Pr00f.

So the best way is... to buy the game from steam store OR buy only key from the black market ( 90% of them are stolen or banned and that's why they are so cheaper, around $5-10 ).

I can offer you CoD 4 Retail Key - 100% not used, legit, NOT banned, authorized, guarantee ( it's 100%, because it's brand new from store ). For $16. But I know most people can't accept this, so noone will buy, and... that's all .

Ofcourse can use MM.

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I can offer you one that's been used but isn't banned, stolen, or anything like that. 10$. And like the guy above me said, it can't be activated on steam.