You have to beat the bushes. Go to the track. Network. Lots of cars been sold word of mouth. People don't want to deal with scammers, low ballers, idiots and time wasters they attract with ads, regardless where they are posted. Cars that guys will sell but aren't advertising them.

Nice cars, ex-Pro Stockers, Top Sportsman, etc. I know of several that were bought. Never advertised. Don't know any now, but have been out of touch lately.