Today is the last day to use the Walgreens 20% off coupon! This coupon is valid only on regularly priced items, and it expires today. Visit Walgreens for a moneymaking deal on St. Joseph aspirin! This month, buy one box of St. Joseph aspirin and receive 1,000 Balance Rewards Points, later worth about $1.00. Use the 20% coupon, which will deduct first, and then use a $1.00 manufacturer coupon.