Sam's Club is a membership-only  warehouse club owned and operated by Wal-Mart Stores, Inc.. The first Sam's Club opened in April 1983 in Midwest City, Oklahoma in the United States.

Sam's Club does not accept any credit card other than its own card and the Sam's club Discover Card; debit cards are generally accepted.

Source: Wikipedia

SAM’S CLUB has six Club locations now open in Canada (ETOBICOKE, RICHMOND HILL, LONDON, VAUGHN, PICKERING and CAMBRIDGE) . Currently, there are more than 600 Clubs and 48 million Members in the U.S., Mexico, Puerto Rico, Brazil, China, and Canada.