Walgreens Coupon Policy and Shopping Hints - Springs Bargains Generally (and now according to their official policy), Walgreens stores allow you to use two coupons for each products on a B1G1 Free sale, including the free product. For example, if hairspray is on sale B1G1 Free, you can use two $1/1 coupons - one on the item you buy, and one on the item that is free.