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GameFly / GameFly UK tweeted a new coupon code good for 20% off any PC download, preorder, or DLC purchase to celebrate their 10th anniversary.
The coupon code is ANNIVERSARY
It expires on 10/24. Stacks wth their current sales. For example, Skyrim Dawnguard is $11.19 after the coupon. Dead Island is $5.99 after the coupon. Both are Steamworks.