Gamefly are currently running a tasty little sale that sees loads of 2K games reduced by 75%. Highlights include XCOM: The Bureau for £4.99, Civ V for a fiver and Sid Meier's Pirates for £1.25. It's all on the splash page, and you can save even more with the UKFEB20OF voucher code. Thanks to xEndox @ HUKD!
However, the cheekiest thing about this promotion is a free copy of Spec Ops: The Line, which you'll be sent via email when you buy a participating game. As far as I can see, there's nothing stopping you from buying one of the UFO games for 75p, then laughing all the way to your free game.