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Suggesting someone waste $870 by buying 100x as many as they need is not helpful. Your numbers for the ESP are wrong - I can get one for less than $2. https://www.aliexpress.com/item/Free-shipping-ESP8266-serial...

Yea, even the ESP32 on a more user friendly package like NodeMCU or WeMos are still under $5. So he appears to really be downplaying the markup.

If you think you can do better, please do! I will be sure to buy plenty when you deliver your cheaper version.