I’m speaking from 6 months ago. My hacker (vuln researcher) friend just convinced to buy one, I went to the store and bought one. Probably just an uptick in sales right now because of similar blog posts and the current HN hit.
Ah I don't imagine there are any physical stores by me that would stock this. That said I did a google search for "flipper zero site:cz" and it seems there's sometimes second-hand ones listed on ebay-like sites, so that's an option.