Hi guys. I'm subscribed to the Green Man Gaming Newsletter, and using a 25% voucher I got on it, I just paid £13 for the Steam version of XCOM: Enemy Within.
The problem is, my friend tried to use the code I got, but it's valid only for my user... :(
So, if you want to try, create an account there and subscribe to the newsletter.
This is not spam or anything, but my buddies and I always share promotions. I paid for B:AO £20 on release date using g2play.net
Hope I can help.