Why assume the guy would want a Yamaha. Mercury & Mariner can be bought quite cheaply in Europe, as well as the States, why is everybody so keen to give their hard earnt money to SA.
Having been in Belgium and Italy recently, it suprised me how much the engine prices differ to ours. And now that we have the Chunnel, you can be back from Belgium the same day.
If you ship from abroad, you would normally be liable for shipping, insurance, duty of around 2% (depending on HP) and vat. Plus a few incidentals that get added by shipping agent.
Warranties are supposedly world wide, but as Charles says, you can experience problems, especially with Yamaha. Merc & Mariner seem ok if purchased in Europe, Belgium seems favourite cause that is where the UK importer (Barrus) get theirs from.
There is a couple of guys in this country who can source you cheap motors from abroad. Mostly Mercs. PM me for their details. What size motor was you thinking of?
It is better to remain silent and be thought a fool, than to speak and remove all doubt!