If for some reason you still haven't let XCOM: Enemy Unknown get its sharp, slimy hooks into you, Green Man Gaming has a heckuva deal on the PC version. Already discounted to $20, you can knock it all the way down to 16 bucks with the coupon code GMG20-P4DLK-FKYRS.
We suggest you use the savings on building satellites. Like, as many as possible. Always.
Released in 1993, the original X-COM is widely regarded as one of the best games ever made and has now been re-imagined by the strategy experts at Firaxis Games. X-COM: Enemy Unknown will expand on that legacy with an entirely new invasion story, enemies and technologies to fight aliens and defend Earth. Players will control the fate of the human race through researching alien technologies, creating and managing a fully operational base, planning combat missions and controlling soldier movement in battle.