"Hay Box" is a new term for these that I have not heard before, is that the common Canadian name?
In Australian use, these are known as Hot Boxes, and I understand the US calls them "Mermite Cans", or M-1944 Cans. Under that name, they frequently appear (or the inner contents) on US Ebay, although of course you'd then be up for the postage costs you're trying to avoid.
I do have a couple, but I'm probably too far to be of much help!
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