Price differences occur because of differences in VAT rates. E.g. on amazon.de prices are shown with German VAT included. The German rate is 19%. But when I buy something there from the Netherlands, prices are recalculated to include the Dutch rate of 21%.
An example: if the item is priced at EUR 119, I need to pay EUR 121.
I guess the same thing happens between Spain (21%), UK (20%) and Portugal (23%).
There is nothing secret about this recalculation. Amazon says that they do this, and they have to because it's the law. (Or at least their interpretation of the law.)
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