Walmart Box on Conveyor Belt

FILE - In this Nov. 9, 2018, file photo, a box of merchandise is unloaded from a truck and sent along a conveyor belt at a Walmart Supercenter in Houston. Walmart is rolling out an unlimited grocery delivery subscription service this fall for a $98 annual fee. The service will reach 1,400 stores in 200 markets and allows the nation’s largest grocer to further tap into time-starved shoppers looking for convenience. (AP Photo/David J. Phillip, File)