Reminds me of a seller at a local flea market some time back. He used to have bins full of coins on his table with a sign, any coin for $1. I used to get handfuls of
Mercury dimes from him and he would drop the price even more for buying many. In those piles I also found a 42/41, 21, 26S and many others. Due to him I started many multiple sets of those. Most were in really great shape. Of course and unfortunately he sort of vanished. That is one of the problems with a flea market. People come and go and no one usually knows where or why or how.