Sellers of staples are at an unfortunate crossroads By: CNBC.com News May 19, 2015 at 12:30 PM EDT Companies such as Wal-Mart and Costco are at the intersection between lower food and gas prices, and consumers' reticence to spend more. Read More >> Related Stocks: Costco Wholesale Kroger Co Wal-Mart Stores, Inc. Whole Foods Market