Today only, Woot offers the Stanley 16-oz. Utility Insulated Mug, model no. 10-01191-002, for $3.99 plus $5 for shipping. That's $6 under the lowest total price we could find for a similar mug elsewhere. It features a leak-proof lid, large handle, and is BPA-free.

Need more than one? You can buy two for $7.98 plus $5 for shipping (Buy.com charges a penny more).