LITTLE ROCK, Ark. - Wal-Mart Stores Inc., the world's largest retailer, announced Monday it would expand its discounted prescription drug program to offer 90-day supplies for $10 and add several women's medications at a discount. It also said it would lower the price of more than 1,000 over-the-counter drugs. The move marks the third phase of a company program that began in 2006 to provide a 30-day supply of generic prescription drugs for $4. The Bentonville-based company said the program has saved customers more than $1 billion. With the expansion, the company began filling prescriptions Monday for up to 350...