Hi, Antoni!
Yes, we in Canada have all the taxes everyone else has and then some!
until recently, in Ontario, we had both GST and PST (federal and provincial sales taxes). They weren't the same in every province. Ontario recently converted to HST or "Harmonized Sales Taxes" which bundled the two with a minor discount. But none of these applied until time of purchase, so the difference in pricing I was talking about was exclusive of these ( and the higher the price, the higher the tax).
It may be right that import duties and/or exchange on the Euro are at fault here. The import duties are applied to the shipments, so vendors of course include them in their retail price, passing the cost to the consumer. Imports from the US into Canada are mostly NOT affected or nearly so due to the NAFTA Agreement.
So we have the same kit, boxed in the US, selling for about 30% less than the German Revell kit...