The great thing about European Union is that we all live in a single market. There are no import duties or other protectionist taxes when you shop cross-border in EU. Unfortunately, “single market” is not exactly single when it comes to online consumer retail and the worldwide king of it — Amazon.
There are 6 European Amazon stores — EU5 + limited (books only?) store in the Netherlands. If you live anywhere in EU, but not in one of these 5–6 countries, it doesn’t make any technical difference for you from which one of these stores to buy (provided you can handle the process in their languages, but you probably know it by heart anyway).
However, when it comes to catalog selection, prices and shipping options all of them differ — sometimes symbolically, sometimes quite dramatically.
That's why I decided to create a simple tool to search all of these sites at once. It turned out that the user experience I imagined, with all 6 sites in iframes on one page, is not quite possible on the modern web. So, I ended up creating a Windows Store app in addition to the web version.
marker.js