My wife just called and said she found McCormick's Hickory Smoked Salt at Big Lots. "They're two dollars each," she said, "how many do you want?" This stuff usually costs around $5 a pop.
This is the salt that they discontinued. Eventually I'll have to figure out some other brand to use, and actually mail-order it. But for now at least, I can keep making my jerky with my original ingredient.