I do not know if my information is still correct as it is from several Hersheys ago...
I talked with the guy back then (I visit that tent every year) and he said then that he had a huge stash of tools, much more than he could bring, and that Hershey was his only venue. The rest of the time all the tools were back in storage and he did not have any time or interest to find and sell particular items.
He seems to be known now as "The jack guy."