Update: Walmart has it for $9.27 after pickup discount (same price at Amazon as an Add-On item).

Amazon has the Contigo 16 oz. Autoseal West Loop Travel Mug (Black) for $12 with free shipping on $25+ or with Prime.

Its double-wall vacuum insulation keeps beverages hot for up to 5 hours or cold for up to 12 hours. Averages 4.4/5 stars on Amazon.