I see it all the time in Europe. Go to any online store and see how the listed price jumps up during checkout due to "taxes an fees". Even though I specify that I'm shipping to Finland, they're incapable of calculating taxes until the last stage of the checkout process.
Airlines do those things here too. Air Baltic charges you something like 15 euros to print a boarding pass. Ryan Air is notorious for these various hidden fees.
It's possible that the foreign website shows the price including VAT at their local percentage. Finland has 24% VAT (25.5% in 2025) on most products so at checkout you get the price with Finnish VAT. It is also possible that Finland has various consumption fees that are only applied after the website verifies that you are indeed Finnish.
VAT is a complicated tax. I prefer to get petrol in The Netherlands because despite higher gas prices than Germany and Belgium, it is much easier to get the VAT back at the Dutch tax office than it is with the German or Belgian tax offices. Every country is its own silo.
