Did you try contacting either? If it's dealers, they're just trying to lure you into visiting them in person. That way, they'll find a way of selling you a car and more often than not, people actually fall for it. 

If it's listed by owners, chances are, they're either trying to sell their cars in desperation or they're (most likely to turn out to be) scammers. I've heard of a few people getting lucky by purchasing cars via CL (one Cambodian guy needed to sell his car for cash due to family issues). 

In any case, take a step with caution, especially for cars listed by owners. Try to get a clarification about the forms of payment they seek.