NEW YORK--(BUSINESS WIRE)--American Express (NYSE: AXP) today announced that Sam’s Club, the eighth largest U.S. retailer and a leading membership warehouse club for small businesses and consumers, will accept American Express cards as a form of payment starting October 1, 2015. The acceptance of American Express throughout the more than 650 Sam’s Club locations in the U.S. and Puerto Rico will provide Card Members with access to high quality-products, brands and services at a great value. “We