Have you tried searching at and emailing some of the hot sauce specialty stores? I found a store that still had a case of a sauce a friend loved, and they sold me the case.

Searching just via Google won't necessarily tell you what a store has in its database--or the back room.
Sort of! It's a store specific brand, and we've asked at a couple of the stores, but none of them had it. E-mailing them is probably a good idea to see if it's in stock anywhere.