Bai Rainforest Water 18-oz. Variety 12-Pack $12 w/ Prime + free shipping

For Prime members only, Amazon offers the Bai Rainforest Antioxidant-Infused Water 18-oz. Bottle Variety 12-Pack for $11.99 with free shipping. That's $12 less than you'd pay in local stores. It comes in four tropical flavors, and each serving only contains five calories.