Amazon offers the Powerade Zero 12-oz. Bottle 12-Pack in Mixed Berry for $4.03. Add it to your cart via Subscribe & Save to cut it to $3.83 and bag free shipping. That's tied with last week's mention and about a buck under the price of a 20-oz. 8-pack at your local store. This calorie-free sports drink contains electrolytes and vitamins B3, B6 and B12.
Be sure to cancel your subscription after your order arrives to avoid being billed for subsequent shipments.