Scam.
Next he will tell you that the tractor is now in Portugal but he will pay all shipping, all he needs is a deposit to hold it for you. For some reason Kubotas are the choice of all the scammers for their games.
A while back somebody figured out how to hijack Ebay accounts and suddenly hundreds of old ladies switched over from selling scrapbooking stuff to offering Kubotas. I think the game continues on Craigslist. One certain clue is a price under $5k, I think this is because there is a limit on Western Union Money orders that is lower than that figure.
Google some text from that CL ad and I expect you will find that Kubota is offered 'locally' from Guam to Nova Scotia.