Scam...as soon as they start with cashiers check...it is a scam. And they usually will have a story about how they have a cashiers check for several thousands more than you are asking. Then apply to shipping and wire back the difference. The cashier checks are really good forgeries....usually because they are a near exact copy of a cashiers check that really exists. It takes a week or two for the forgery to be caught, then you have lost your boat, and the money that you wired back to him.
It is not that uncommon for out of country purchases...but they usually offer to use some type of escrow account and wire the money in.