I do not say that I have the answer to the original question, but as very often in this forum, the discussion tends to focus around the US. The US customers have had, and still have really cheap prices offered for Canon gear. I just got back from NYC and bought two 600ex rt plus a st e3 at full price at B&H, and that price is two thirds of the price in Norway. Before the limit on price was put in effect, a professional nature photographer could get the 800mm for approx 3000 USD less than in Norway, which meant that you could fly over and have a weekend there, and still save money. Thus I argue that the camera stores catering to the professionals in other countries than the US had a really hard time staying in business when B&H decided to lower the prices.
Does Norway have import duties? I could have driven from Boston to Toronto in a few hours, and bought a 600 II for a couple thousand less than at B&H. But the import duties when bringing the lens back into the US would have been significant.
Once you pass approx 35 USD you have to pay tax. Tax is 25% , so that would still be better. I am still happy as the kit I bought costs 12.300 NOK, and I got it for approx 7.700 plus NYC taxes
But my first post was because I spoke to a few people working in the relatively big stores in Norway, and B&H (never seen Adorama have anything cheaper than B&H) would drive the prices down, thus running the risk of driving them out of business.