As Wal-Mart Stores Inc. has grown into the nation's biggest grocer, St. Louis is one place where its Supercenters have been curiously scarce. Now, Wal-Mart says the area needs more of its grocery megastores. "We really like St. Louis," said spokesman Ryan Horn. "We're looking very closely at a number of places in the St. Louis area, and that's not going to change." A lot of others wish it would.