Amazon has 18-Pack 8-Oz Horizon Organic Low Fat Milk (Chocolate w/ DHA Omega-3) for $13.11 when you ‘clip’ the 20% off coupon located on the product page or here and checkout via Subscribe & Save. Shipping is free w/ Prime or on orders of $25 or more.
Note: Coupons are typically limited to one per account. You may cancel Subscribe & Save any time after your order ships.