Established in 1951, Circle K Stores Inc. is one of the leading convenience store chains in the United States. Located in Tucson, Ariz., the store offers Circle K Coffee, ThirstBuster fountain drinks, beers, snacks, mobile-prepaid wireless phones, gift cards, money orders and other general merchandise. It also offers fuels from several petrochemicals companies, including Shell, BP, 76, Citgo and Chevron. Circle K Stores Inc. is a part of Alimentation Couche-Tard Inc., one of the largest convenience store operators in the North America.