I have 13 invites that I am giving away, reply with the email your steam account is registered to, or add me to your steam friend list "klorehore".
Take care.
P.S don't add me if you already have a key registered to your account, I am not able to mail over keys to someone who already redeemed a key on their account. If you want a key for your friends or whatever, have them add me or leave me their email so I can send it directly.