As of March 2013, Costco operated 448 membership warehouse clubs in the United States, 85 in Canada, 32 in Mexico, 23 in the United Kingdom, 13 in Japan, nine in Taiwan, nine in Korea, and three in Australia. The base and executive memberships cost $55 and $110 per year, respectively. The company sells food, fuel, and general merchandise to its members but derives most of its profits from membership fees. Costco is now the third-largest retailer in the U.S. based on revenue.