QUEEN CREEK, Ariz. - An Arizona man says he has found out the hard way just how to get banned from Walmart for life. Joe Cantrell loves to ad match. He goes through circulars to find the biggest discounts, and then goes to Walmart. According to the company's website, they match the lowest advertised price on identical products, but when Joe tried doing that last week, the unthinkable happened. What started as a trip to a San Tan Valley, Ariz., Walmart to get ornaments for his family's Christmas tree, turned into the biggest nightmare of Joe's life. "I was handcuffed,...