Amazon offers Prime members the Zojirushi Tuff 12-oz. Stainless Steel Vacuum Mug in Black, model no. SM-JD36, for $23.29 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.46.) That's the lowest total price we could find by $13, excluding other Amazon vendors. It features a stainless steel body, vacuum insulation to keep beverages hot or cold for hours, and nonstick interior.

Want it in another color? PowerforApple via Amazon has it in Cinnamon Gold for $23.63 with free shipping for Prime members.