Small country, small market. Small market, low supply. Low supply, high prices.
I am free to buy and sell to and from any country in the world, the issues is not everyone is willing to deal and pay for international shipping which ends up quite high for a cheap SFF tower system.
In principle, shouldn't one of the consequences of the EU project be that intra-EU shipping rates should, for the same distance, be identical between within the same country and between EU countries? (Of course, I realise that outcome may not yet have actually been achieved in practice.)
One would hope that if they are successful in improving those transport links, shipping costs will reduce as a result.
For desktops, it shouldn't really matter. One quite likely already has a spare USB keyboard with the right layout, and if one doesn't, it shouldn't cost much to buy one (whether new or second-hand).
Big markets like US, UK and Germany have low prices on consumer products and in small markets like Austria and BeNeLux countries consumer products cost more.