Next week at Walgreens, large bottles of Crest Pro-Health mouthwash will be on sale for $4.49. Buy one and earn a $2.50 Register Reward! A Register Reward is a coupon that prints at checkout; it can be used for store credit on a future purchase. Print a $1.00 coupon and save it for the sale. After the sale, Register Reward, coupon and extra Beauty Points with an in-ad coupon, the final price will be $0.79! These bottles are twice as big as the bottles that were $0.99 last week at Target.