The Top 10 S&P 500 Dividend Stocks to Buy Now Same-store sales, excluding currency rate fluctuations and the impact of gasoline price deflation, rose 3% in the U.S., 8% in Canada, and 3% internationally. Costco's largest rival, Wal-Mart Stores, Inc.'s ( WMT ) Sam's Club, saw adjusted same-store sales in the U.S. rise just 0.1% last quarter. The views and opinions expressed herein are the views and opinions of the author and do not necessarily reflect those of Nasdaq, Inc.