Dirt 3 is currently 100% free on the Humble store. All you need is a Humble account. Free is good at the best of times, but the Dirt games are some of the finest racers of the past decade, so this is as good a time to try one if you’ve never played them.
via Kotaku http://kotaku.com/get-a-very-good-racing-game-for-free-1788834139