Costco Wholesale Corporation, doing business as Costco, is an American multinational corporation which operates a chain of membership-only warehouse clubs.[3] As of 2015, Costco was the second largest retailer in the world after Walmart,[4] and as of 2016, Costco was the world’s largest retailer of choice and prime beef, organic foods, rotisserie chicken, and wine.[5] Costco is ranked #14 on the Fortune 500 rankings of the largest United States corporations by total revenue.[6] Costco’s worldwide headquarters are in Issaquah, Washington, a suburb east of Seattle; the company opened its first warehouse in Seattle 36 years ago in 1983.[7][8] Through mergers, Costco’s corporate history dates back to 1976, when its former competitor Price Club was founded in San Diego, California.[9][10][11] As of July 10, 2019, Costco had a total of 776 warehouses:[12] 539 in the United States and Puerto Rico, 100 in Canada, 39 in Mexico, 28 in the United Kingdom, 26 in Japan, 16 in South Korea, 13 in Taiwan, 11 in Australia, two in Spain, one in Iceland, one in France, and one in China.

Dollar Tree Stores, Inc., formerly known as Only $1.00 and Everything’s a Dollar, is an American chain of discount variety stores that sells items for $1 or less. Headquartered in Chesapeake, Virginia, it is a Fortune 500 company and operates 14,835 stores throughout the 48 contiguous U.S. states and Canada.[2] Its stores are supported by a nationwide logistics network of eleven distribution centers. The company operates one-dollar stores under the names of Dollar Tree and Dollar Bills. The company also operates a multi-price-point variety chain under Family Dollar. Dollar Tree competes in the dollar store and low-end retail markets. Each Dollar Tree stocks a variety of products including national, regional, and private-label brands. Departments found in a Dollar Tree store include health and beauty, food and snacks, party, seasonal décor, housewares, glassware, dinnerware, household cleaning supplies, candy, toys, gifts, gift bags and wrap, stationery, craft supplies, teaching supplies, automotive, electronics, pet supplies, and books. Most Dollar Tree stores also sell frozen foods and dairy items such as milk, eggs, pizza, ice cream, frozen dinners, and pre-made baked goods. In August 2012, the company began accepting manufacturer’s coupons at all of its store locations.