So the actual bill for the stickers came in today.
Because I had to pay 3 euro and 62 cents of import taxes to the EU, FedEx gets to charge another 12 euro on top of that.
So 20 dollars in stickers, with 9 dollars in shipping, plus 3 euro 60 in import taxes and another 12 euro in administrative fees to Fedex for the 3 euro in taxes.
Total cost: 42 euros and 60 cents for 100 stickers.
Fuck Trump, Fuck the EU.
Fuck tariffs.
Edit: If you want help with finding an EU manufacturer for stickers for the next run and (also) produce in the EU, which should be easy with the Finland IBAN you have, let me know. I've solved less difficult "find me a manufacturer"-problems.