This coupon has expired $0.75 for Duncan Hines® Cake or Brownie Mix. Offer available at Walmart. expires on 01/01/20 Other coupons you may be interested in $1.00 for Sangria Senorial (expiring on Monday, 01/02/2023). Offer available at multiple stores. $1.00 for Jarritos (expiring on Monday, 01/02/2023). Offer available at multiple stores.