Need a thermos

[cara1]

(cross post from Baby Feeding)
DS starts preschool next week. They don't want the kids to use sippy cups; they want me to send him in with a thermos. Fine idea, but the stores don't have lunch boxes or thermoses this time of year. Anyone know where I can find a kids thermos? TIA.

[egoldber]

Can't you just use a cooler bag with an ice pack and send it in a sippy just for transport? If they are just going to pout it into a cup, whats the difference?