Sam's Club offers its members the Zulu Core 20-oz. Glass Water Bottle 2-Pack in Pink/Blue or Grey/Teal or the Atlas 20-oz. Glass Water Bottle 2-Pack in Pink/Blue for $9.91 with free shipping. (Non-members pay a 99-cent surcharge.) That's $7 under our April mention and the lowest price we could find for a 2-pack of either style by $9. (Most retailers charge at least $11 for a single bottle.) Each BPA-/BPS-free bottle features a protective silicone sleeve.