You didn't do it right, when there's some disagreement between importers prices buy from the one offering the best price, if that's not possible, NEVER tell who's offering the good deal. These mofos always complain to the manufacturer who will threaten the one offering good deals, specially if in the same area like it's Portugal and Spain.
As I see it those Danish dealers have met a favorable deal with Stax that allows them to offer generous discounts compared to the crappy dealers in Iberia who don't have large stock. For most of the Stax range they serve in a pre-order policy, you pay half the price, they order to factory, and a few weeks or months later, you get your cans and pay the remaining amount. In this fashion Stax can't offer any favorable discount to such importers, so the prices will always be higher than on "better" dealers.