Target offers the Thermos Hello Kitty 10-oz. Funtainer Food Jar for $14.99. (Amazon charges the same with free shipping for Prime members.) Choose in-store pickup to dodge the $5.31 shipping charge. That's $7 under the lowest shipped price we could find. It features stainless steel walls and purports to keep food hot for up to five hours.

Update: It's unavailable for pickup at Target; however, Amazon still offers it for $14.99 with free shipping for Prime members.