Virtually buy everything one's favorite vendor has found for them (they'll work harder for you)...

Let everyone at a flea market know what you're searching for as they pass your path coming and going. All it takes is a simple (ILLUSTRATED) 8½ x 11 pinned to your shirt... or a hat saying the same thing... and it wouldn't hurt to have a string of drilled chips on your person...

...and, of course; pass out your cards as if there's no tomorrow.