Walgreen's- FREE Airwick

I went to Walgreen's today and found these Air Wick Freshmatic air freshners on clearance for $3.99 each. In Sunday's paper they had a $4 of coupon on these. Since the coupon was for more than the item the register beeped. My cashier then adjusted the coupon down to $3.99 each. Before coupons the total was $25.14, after Q's=$1.20!!