They really push the pyboard which is cool and all, but imho, the killer application for Micropython has been the ESP8266 port and now the ESP32. The original

They really push the pyboard which is cool and all, but imho, the killer application for Micropython has been the ESP8266 port and now the ESP32. The original pyboard can be had for around $20 and used to be closer to $30. The ESP8266 is a couple dollars, and the ESP32 is just north of $5. Obviously, we're only talking about a handful of dollars, but for embedded systems, it matters.