orcishgamer: They just added Anno 2070 to the Amazon downloads coupon page. Weird looking game, dunno if it's good, but I think it just came out. If you still have several of those coupons you can stack them and score it for pretty cheap.
It's a sci-fi economy / city builder sim, gameplay is based on the medieval Anno series (aka 1603 A.D., Dawn of Discovery, etc.). I haven't played it myself yet, but it received a lot of praise (and not only from the official "reviewers" either). The Anno series is generally considered to have very solid gameplay, it's probably one of the most successful German gaming franchises. Anno 2070 is a departure from the usual medieval theme, but even though the fans still seem to like it, which means that the devs must have done something right (changing a well-loved core element of the game and still getting praise from the fans is very hard to do).