From February 1 – 29, 2012, American Express is offering a $50 credit back when you use a registered American Express Card to make a purchases at two or more participating merchants with combined purchases totaling $200 or more. To get this deal, register your card here. Registration is limited to the first 15,000 enrollees. You must use the same registered card for each transaction. There are over 300 participating merchants to shop and dine at.