Finding certain cars

So if Im like any normal Mopar guy/gal we always shoot for certain cars, such as a true H code car, a 4 speed, or maybe a certain color. But Im curious- How do you locate that special car? Me specifically, Ive been on the hunt for an EK2 70' Duster. I very seldom see projects like that. Im looking for tips so maybe one day I can make that happen. What or how does everyone locate that "special" one?