Saw on CAG that you can get SimCity for $45 on Amazon right now w/ code CAGROCKS. Also, comes with a $5 credit on Amazon, making it essentially $40. Pretty good deal if you're looking to pre-order to get the Hero vs. Villain pre-order DLC.
Seems like a decent deal on a game that looks pretty promising.
Also, this only applies to the downloadable version of the game.