Try looking at bepreparedtosurvive.com
They have a small tin with lid, 6.5x3.5x2.6 with or without an attached flip over handle for cooking. A larger 7.8x5.1x2.8, no handle option. And a locking 5x3.5x1 model. Cheers!
-Bill Liptak
Looked there, in fact chatting with Denise from bepreparedtosurvive to see if they had anything kicking around that isn't on the site. She went so far to take a seirra cup and try normal household lids for me to see if one would fit!
I'll prob get the 5x3.5x1 tin, but it would be nice if something like that existed that were in the 4x7x1 range.