This is the classic Nigerian scam.

They send you well over what the product is listed for so you "return the difference and the item to them" .

Don't fall for this. If you do, then you truly deserve what you get. When you're dealing with strangers, nothing is for free.

Don't cash the M.O.'s, they're fakes. Keep them as souvenirs if you want, but whatever you do DON'T send them your car. Besides, where are you supposed to send it to????