Low gas prices are good for consumers, less so for Costco & Kroger By: MarketWatch March 03, 2016 at 16:13 PM EST Costco and Kroger said gas sales declined in the last quarter, just as Wal-Mart announced plans to run its own gas stations. Read More >> Related Stocks: Costco Wholesale Kroger Co Murphy USA Inc Wal-Mart Stores, Inc.