I don't know about other parts of the nation, but I did exhaustive searches on all the major web finders, CarGurus, Autotrader, etc. I wish I had the time to describe my experience. It seemed like 70 % of what looked like good deals were scams. Let me use Paul Miller Ford in Lexington. Just the facts so they don't sue me. They listed a new 2017 F-250 SD. I made an offer. I got a response to the offer. We went back and forth. After a few communications on web and on phone, the salesman tells me he is sorry that he found out the vehicle we were discussing requires the buyer to have an FIN code. It relates to fleet sales.
I had other cases where I drove 200 miles only to find out the listed vehicle was bait.