Wal-Mart Puerto Rico announced yesterday [Wednesday] that it has acquired Supermercados Amigo , the number one supermarket chain in Puerto Rico. Supermercados Amigo's 35 supermarkets and its more than 4,500 store employees will join Wal-Mart's Puerto Rican operation to further extend the company's every day low price philosophy to new locations around the island, according to Bill Cahill, president of Wal-Mart Puerto Rico.