Coupon Book Costco Coupon Book: August 2022 by Sue July 28, 2022 July 28, 2022 425 7/28/22. Check out all the great savings from the August 2022 Costco Coupon Book! This Costco Member-Only Savings Book starts August 3, 2022 and goes through August 28, 2022. Some items may have purchase limits. All products are while supplies last. Costcocoupon book 0 FacebookTwitterPinterest previous post Lemon Cozy Ankle Socks next post Costco Cheesecake, Plainly Delicious