[EA911]

I'm in the same boat and trying other ways of finding cars with very good but slow results. I'm pretty sure the dealers, brokers, flippers are using similar methods because the owners confirm people knocking on their doors out of nowhere without the car advertise or word of mouth, or following people to their homes, drive way finds, etc...
One of the methods is even illegal and can produce many, many results but I'm not taking that route.

Good luck and you are going to literally need it because it's a luck game with a bit of quickness. I went through (and still going through) the same frustrating process. Just waiting for the right car to be found.