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Bulletstorm is on sale for $11.98 at Direct2Drive. Only the US site appears to have it discounted. If you use coupon code 8DFE4F43CBEAD0DB7B8AADFC6BF06D7C you’ll save 15% off, which makes the game only $10.18. This game uses Games For Windows Live.
It has an 82 metascore but going from what I’ve read online you’ll either like it or you won’t. Might not be a bad idea to try out the demo first on Games For Windows or at Steam.
If the coupon code above has expired you can generate a new one from the link in the promo coupon codes page.