Get a 12 Pack of Ghirardelli Chocolate Brownie Mix, Double Chocolate, 18 Ounce Boxes for $20.93 shipped when you "Subscribe & Save" on the right-hand side of the page. At $1.74 per box this is the lowest price we could find for 12 boxes. This brownie mix has a 5-star rating from 17 reviews. Note that once you receive your order you'll have to cancel your subscription to avoid automatically placing future orders. There is no sales tax (except in KS, KY, ND, NY, and WA).