As one of its daily deals, Meh offers the Contigo Pinnacle 14-oz. Thermal Autoseal Stainless Steel Travel Mug 2-Pack in Violet or Samba for $18 plus $5 for shipping. That's the lowest total price we could find by $10, although we saw it for $2 less last fall. It features vacuum insulated double-walled stainless steel, venting system, and purports to keep liquids hot for up to five hours or cold for up to 12 hours.