New York City ? With little money left after buying food and fuel, American shoppers handed most retailers their most dismal March in 13 years.

As retailers reported sales results on Thursday, Wal-Mart Stores Inc. and Costco Wholesale Corp. were among the few winners, as shoppers stuck to basics. Wal-Mart raised its earnings outlook, noting that better inventory control helped to limit markdowns on merchandise. It also said that April sales should top prior expectations.

But March proved to be bleak for most others, including J.C. Penney Co., Gap Inc., and Limited Brands Inc. All of them reported sharp drops in sales. Even high-end department stores like Saks Inc., languished.