Directly in Steam it’s not that easy, you need a billing address and Steam checks the payment method to verify the country (although I don’t know if certain prepaid cards work for this as well).
You still have Steam keys, that can be sold anywhere though, and not everyone will care that this cheap key, intended for the Polish market is bought by someone in Germany.
PapstJL4U@lemmy.world [bot] 4 hours ago
Companies are not allowed to not sell to other EU members. A polish company is allowed to sell in Germany, and a German buyer is allowed to buy from polish Companies without being unfair treated.