The boards, kits, and components are widely available online, and are stocked by specialist stores such as Adafruit in the US and element14 in the UK, as well as the official Arduino store ...

The $114 starter kit includes an Arduino MKR WiFi 1010 board—basically a tiny, programmable microprocessor—and an IoT Carrier that looks kind of like a flower with an OLED screen in the center.