This coupon has expired $1.00 for Optimum Nutrition® Gold Standard Whey™ Protein Powder. Offer available at Walmart. expires on 09/02/18 Other coupons you may be interested in $1.00 for Jarritos (expiring on Monday, 01/02/2023). Offer available at multiple stores. $1.00 for Sangria Senorial (expiring on Monday, 01/02/2023). Offer available at multiple stores.