Remarkably its cheaper in Australia ($3,368 post-tax, $3,060 pre-tax USD) — which is a shock as price-gouging by tech companies in the Australian market has always been a huge problem.
I would assume its a number of regulatory and supply-chain factors — but also — they'll charge what they think they can get in the market, and the more a product is considered a luxury purchase, the more they'll up-the-price.
For instance, I purchased a MBP in 2018 in the UK and it was considerably cheaper than the same product purchased in AU. I just had the keyboard customised to use the AU keyboard (wasn't a huge expense) instead of the default UK/EU keyboard layout.
Tough ask, but if you are in Poland, could you exchange to Euro and purchase the product in a neighbouring country?