Amazon has 8.4-Oz Duncan Hines Mega Cookie Double Chocolate Chunk Pan Cookie Mix for $2.50 – 5% when you checkout via Subscribe & Save – 20% when you ‘clip’ the coupon on product page = $1.87. Shipping is free w/ Prime or on orders of $25 or more.
Note, coupons are typically limited to one use per account. You may cancel Subscribe & Save anytime after your order ships.