Print two more coupons to save on Purex Crystals laundry fragrance boosters! The coupon just reset! This month at Walgreens, Purex Crystals are on sale, buy one get one free. According to the Walgreens coupon policy, a coupon cannot apply to a free item. Buy four and use one high-value $3.00/2 printable coupon. The final price is $2.65 per bottle!