walmart said december was the largest sales volume month in its history walmart inc reported strong quarterly sales tuesday as cashstrapped shoppers gravitated to the discount retailer for food and other essentials and continued to pay higher prices on many items compared with last year us comparable sales those from stores and digital channels operating for at least 12 months rose 83 in the quarter ended jan 27 compared with the same period last year that beat analyst expectations of 49 growth according to estimates from factset 