Hmm, I was going to pass on the buy 2 get 1 sale because I'm broke, but then I could get some greatest hits for fairly cheap. Mario Galaxy, Super Paper Mario, and Punch-Out for $40 total? Not bad.
One retail deal to look into is buying Arkham City at kmart. If you are signed up as a "shop your way" member there (free), you'll get a $30 coupon to use on future gaming purchases when you buy AC during the first week its out.