Amazon offers the Propel Zero Calorie Sports Drinking Water 16.9-oz. Bottle 12-Pack in Berry or Black Cherry for $3.61. Check out via Subscribe & Save to cut that to $3.43 and bag free shipping. That's $2 under our mention from three weeks ago and the lowest total price we've seen. (It's also about $2 less than you'd expect to pay in local stores.)

Be sure to cancel your subscription once your order arrives to avoid being billed for subsequent shipments.