Print the reset Arm & Hammer coupon! Starting on 6/22, Arm & Hammer laundry detergents will be buy one get one free at Walgreens. According to the new Walgreens coupon policy guidelines, a coupon can no longer apply to a free item. Print a coupon and save $3.00 on two Arm & Hammer detergents. Buy four detergents and the final price will be $2.75 each!