[mexico city] Grupo Gigante, Mexico's third largest retailer, is fighting back against market leader Wal-Mart and its strategy of everyday low prices with a daily lottery for Gigante supermarket customers. "La experiencia Gigante" features a scratch-and-win ticket for each $12 spent in the store, with cash prizes between $1 and $2,500 and the chance to win one of Volkswagen-owned Seat's Alhambra minivans. Local shop Clemente Camara handles a radio and TV campaign.