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FEAR 3 is on sale for $4.99 / £3.25 (75% off) until 5/10/12 at 11:59PM PST at GameFly / GameFly UK.
This game uses Steamworks, so you’ll need to activate it on Steam.
It has a 74/100 metascore. I’ve had this game for a while now and haven’t played much but co-op is pretty fun.