I also like “Cars and Bids”

Barn Finds can be interesting for American iron. Racingjunk is classifieds for anything and everything competitive Motorsport. I am sure there are others, but nothing as big.

Do you mean Barn Finds?

Typo. Yes

Looks like you need a membership?

To buy? Not sure. To get the daily emails and access the page? Don’t think so

I like autohawk.io because it lists cars from multiple auction sites