Really no one sells them?
I can go get 10-15 cans in a matter of moments, will you be anywhere near IAH or LAX in the next 2 weeks?

http://www.debelfoods.com/recipes_justWhites.htm

They also generally have the whole powdered eggs just next to it.

Here H-E-B and Kroger carry them, I rather like them for cooking in some dishes.

I am quite sure I bought them in the baking section at Publix more than once while in SoFla.
Academy stores also carry them in the camping section.