During the period from the 1950s to the late 1980s, discount stores were more popular than the average supermarket or department store in the United States. There were hundreds of discount stores in operation, with their most successful period occurring during the mid-1960s in the U.S. with discount store chains such as Kmart, Ames, Two Guys, Gibson's Discount Center, E. J. Korvette, Mammoth Mart, Fisher's Big Wheel, Zayre, Bradlees, Caldor, Jamesway, Howard Brothers Discount Stores, Kuhn's-Big K (sold to Walmart in 1981), TG&Y and Woolco (closed in 1983, part sold to Wal-Mart) among others.