Hi. I want to offer keys for Arma II: CO retail (DayZ working on them). In 4 months, DayZ community growth to 1 million of players, so it's the fastest growing community ever seen. Join them now. Almost no price - 10€ per key on PayPal. Don't miss it. I have many of them, so you can afford as many as you want!
It's not STEAM key, it's retail, so you'll have to register it at the installation. I didn't know where to put, so did it here, if it's wrong, please move to place it should be.