Alan a few other flaws in your calculations
The LV US$ price is their pretax Export price which does not include postage, duties etc.
Buy the plane in LV's shop in Toronto, it would cost you CDN$199 plus 13% taxes which works out as £146.
I cannot explain the price differences from country to country but it applies to lots of other commodities too.
Anybody who has travelled in the States could not help noticing how much cheaper cars, houses, electrical goods etc etc are over there?
But with sales and price information available on the web it's down to choice as to what and where you buy?
If I was intending to buy the No.4 then the choice would be from Germany - cheap postage and no duties!
Rod