I always see these low prices (<$5) on articles and comments but this doesn't seem the be the case for the boards people actually recommend. Are people buying on aliexpress or other cheap alternatives?
https://www.az-delivery.de/en/products/nodemcu-lua-lolin-v3-...
I know I sound like a salesman, but if you subscribe to their newsletter, you'll get that kind of offers all the time.