Bring a briefcase full of cash to the show, and have it sitting out in the open where people can see it, sitting next to a big sign saying you're looking to buy collections (but not right out on the front table where some people also may be thinking about grabbing it and running). That cash will attract potential people looking to sell.
Unfortunately, you'll probably be lucky to even get 1 out of every 20 people coming to talk to you about it that actually have anything worthwhile. You'll also probably want to be sure you only go to shows in states that allow concealed carry so you can protect yourself, and be sure you have a proper license to do so, as well as friends to accompany and back you up, and protect you. That should hopefully work, until the police find out you have such cash, and then figure out a way to pull you over after you leave the show for supposedly changing lanes without signaling, or not using a turn signal at an intersection, and they stop you and end up doing an illegal search and taking your cash as an asset forfeiture claim. if you're lucky, they won't take your car and impound it as well, but don't hold your breath.
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