Do you mean the Aaronson Campbells soup thermos bowl? I remember seeing that and thinking it was a good idea a few years ago. Have googled it for you but all seem out of stock/unavailable.
It sounds a good idea for children going to school so will keep searching and keep an eye on this thread
ok - so I have read a lot already about insulated bowls without lids, flasks etc and getting annoyed with google not finding a similar thing to the campbells but in stock...came across this that made me smile. Not what you were looking for but may amuse you as a back up option.....mad contraption
I'm pretty sure I've seen one in Sainsburys (it would have to be a big Sainsburys with kitchenware in it). All their flasks were in the sale (in fact, I got 2 upright style ones for £1.99 each and they are really good). I haven't got the car this week but the next time I go, I'll check for you.