Somewhat related: If you rent your car via sixt.es instead of sixt.de, you'll get it for a lower price [0] [1] [0] https://www.sixt.es/betafunnel/#/offerlist?zen_pu_location=7... [1] https://www.sixt.de/betafunnel/#/offerlist?zen_pu_location=7...
I wanted to ask "Is it a VAT thing ?" but Spain actually has higher VAT so no I'm pretty sure it's illegal in the EU for the same company to give a different price to customer depending on where they live in the union, I assume they get around that by being "not the same company" but sixt spain and sixt germany instead ...
Skyscanner has come up in this discussion, and full disclosure: I'm an employee. But this is an entirely personal comment.
Skyscanner has a lot of different market-based websites, for example https://www.skyscanner.de and https://www.skyscanner.fr. We don't geo-block, though: wherever you are, you'll have full access to any Skyscanner website, and we'll happily give you whichever market, locale, and currency triple you ask for. And we pass on the underlying market-based prices that we're given. So if you want to know whether different markets get different selections of flights, or different prices for the same flight, it's relatively easy to look and find examples.
Amazon is the same: you'll get different products and prices on de and uk, but if I'm willing to pay shipping then Amazon is willing to sell me stuff from Germany even though the UK left the EU and it's legal for them to block me or give me different prices. Which was very useful when I needed radiator thermostat adapters a couple of months ago.