There was a guy selling them out of a converted storage unit in Whitesburg, GA a few years ago. The one right across the road from the professional wrestling training center that is in an old service station. I had no idea what they were and asked. His response, "You see that stump over there. I you was to shot it it would catch on fire." Then he said, " It might even blow up. "

I should have bought some, but I wasn't too sure if they were legal. Anyway, I think about that conversation and laugh.