Back in the early 80's at the Pomona show (8 miles of tables!), I was walking in and saw a guy pulling lots of brand new boxed Uzi model "A" guns out of a van. I stopped and asked if he would sell me a couple. We made a cash deal, and before I even got to my table, sold both for a good profit. Took less than 10 minutes, those were the days.
That show was good to me, I came home with more guns than I took, and a $3K profit overall.
Conelrad