recently I have found https://bitcars.eu/ Nice initiative, but I did not investigate deeply how they wok - if they sell cars directly or if it is just a catalogue with offers where owner accepts crypto. But what I like is that they offer almost everything - from aston martin sport car to volkswagen camper 
That doesn't change the problem if you have "drug money": if you register the car in your name, you have some explaining to do when you get checked.