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FlatOut: Ultimate Carnage is 75% off this week at the Games For Windows Marketplace. That makes it $4.99 ($19.99). Games for Windows Live isn’t the greatest but this is a really good deal. I actually have quite a few games on GFWL. It works OK for me. I definitely prefer the Steam overlay though.
For those in the UK it’s also on sale at the UK GFW site. Price is £3.74 (£14.99).