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Thanks to all. The suggestions were these
(1) Get a stainless steel thermos, not plastic.
(2) Try www.thermos.com
(3) Target has them. Try the camping good section (AHA! Silly me,
looking in the housewares and dishes section!)
(4) Wal-Mart has them (I refuse to shop there because they sell handgun
ammunition, but that's a whole other issue!) :-)
Some people suggested I work with the school to arrange GF hot lunches for
her. That might be a good idea in some place, but I've seen the hot
lunches at our school and all I can say is YUCK! (Some of her teachers
have asked me if I would start packing lunches for them, too.)
Thanks again!