If you shop at Costco, you should have received your monthly coupon booklet in the mail recently. The cool thing about the Costco coupons is that they are good for a full month. The other cool thing is that if you forget your coupon booklet? It doesn’t matter. You’ll automatically get the discount at checkout (neat, huh?). These coupon deals are good through September 24th so you have a few weeks to take advantage of them.