Well, SASS-KIT is out of the running. Here's their reply to my inquiry...
"Regretfully we have sold out of the empty survival tins. At present we are not able to get more and so I can`t quote you."
I have, however, placed an order at
www.thegrooveshack.com. They have stash tins of comparable size to the BCB tins (within 1/8 inch on all dimensions).
Don't rush to the computer with your wallet until I get them, though. I'll let you know how they are and how they compare to the BCB tins when I have them in hand.
Bear