Kroger and Walgreens are expanding their exploratory pilot of Kroger Express and Kroger Pickup to 35 Knoxville, Tennessee-area Walgreens stores and launch the sale of Walgreens' own-brand health and beauty products at 17 Kroger stores in the region.

Some 27 percent of grocery purchasers say Walmart is the in-store retailer they get groceries from most, more than twice as many as Kroger, the next most chosen retailer, according to market research firm Packaged Facts in the report "U.S. Grocery Market Focus: The Walmart Food Shopper."