For Prime members only, Amazon offers the Vita Coco 100% Pure Coconut Water 11.1-oz. Bottle 12-Pack for $9.99. Order via Subscribe & Save to cut the price to $9.49 and bag free shipping. That's tied with our mention from last week and about a buck under what you'd pay at a local warehouse club store.
Note: Be sure to cancel Subscribe & Save after your item ships to avoid being billed for future shipments.