Costco Sale: Milk-Bone Large Dog Biscuit 15 lb $8.49 by Rhonda August 6, 2020 *UPDATE* 3/24/13 Costco has the Milk-Bone Large Dog Biscuit 15 lb on sale for $8.49 (after manufacturer’s instant rebate), now through April 14, 2012. That is $3 off Costco’s regular price… 0 FacebookTwitterPinterestEmail