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In this Dec. 4, 2013 photo, April Taylor, of Upper Marlboro, Md. (right) buys items with her son Jarhon Taylor (left) on the opening day of a new Wal-Mart store in Washington. The world's largest retailer on Wednesday said that it's expanding Savings Catcher, its online tool that compares prices on thousands of products with those of some of its competitors to cities nationwide in the next few months. (AP Photo/Jacquelyn Martin)