Amazon offers Prime members the DwellStudio for Thermos Vacuum Insulated Stainless Steel Funtainer 12-oz. Straw Bottle in Fauna for $12.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.37.) That's the lowest total price we could find by $10. It purports to keep contents cold for up to 12 hours.