Walmart offers the Igloo MaxCold Gripper 16-Quart Lunch Box in Black for $13.99. (For Prime members only, Amazon charges the same.) Opt for in-store pickup to dodge the $5.99 shipping charge. That's the lowest price we could find by $3. It features a separate insulated tent-top compartment, front and back slip pockets, and leak-resistant, antimicrobial liner.