Amazon offers Prime members the Thermos 12-oz. Stainless Steel Insulator in Gunmetal Grey, model no. 2700TRI6, for $11.11 with free shipping. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $6.25.) That's the lowest total price we could find by $5. It purports to keep drinks cold ten times longer than a bare can.

Buy Now