REI Garage offers the Innate Kahveh 13.5-oz. Stainless Steel Vacuum Mug for $5.73. Choose in-store pickup to avoid the $5.99 shipping fee. That's the lowest price we could find by $11, although we saw it for a buck less in January. It features a screw on lid and keeps beverages hot for up to two hours or cold for up to four hours.