Starting on Sunday, three-packs and eight-packs of Zest bar soap will be on sale, buy one get one free, at Walgreens! According to the Walgreens coupon policy, a coupon can be used on a free item. Print two $1.00 coupons. The coupons don’t have any size restrictions, so buy two of the three-packs. The final price is $0.13 per bar. Be sure to print the coupon now. Coupons tend to disappear toward the end of each month!