Update: This deal is still available.
Amazon has 12-Pack 11oz Pure Protein Strawberry Protein Shake on sale for $16.79 when you clip the 25% off coupon on the item page and check out via Subscribe and Save.
Shipping is free w/ Subscribe & Save or w/ Amazon Prime/or on orders $25+, otherwise, shipping charges will start at $5.99.
Note: You may cancel Subscribe & Save any time after your order ships. Must be logged in to clip coupons; coupons are typically limited to one per account.