Purchase Of New US Stamps And Delivery To Europe

Hello, is it possible to buy current US postage stamps? I would like to buy Priority and imperforate modern stamps. I registered with USPS and chose something. Then I learned that it is not possible to deliver stamps to Europe. I don't understand why, if I pay in advance. Can anyone advise me on how to get fashionable stamps at face value? Ji#345;í

You are out of luck.
USPS is no longer interested in seling stamps into the Wilderness (though that pretty much meant 100% profit as those stamps would likely never reappear on a US letter...).
For a while, USPS had a store on ebay. That was apparently shut down just before/while Covid (again, 100k+ sales per year wasn't interesting apparently...)

My guess is your best chance is finding a collector in the States that wants Czech stamps in trade for US stamps.