Quantity   Component name
1 × ST-Link V2 ICP adapter (e.g. $2.00 from AliExpress) The ST-Link on an STM8S Discovery Board can be used, too
1 × serial interface /w 3.3V level (e.g. a $0.60 CH340 USB adapter) e.g a CH340 USB interface
1 × STM8S target device as listed in the GitHub Wiki (e.g. a $0.70 "STM8S103F3P6 minimal system board") e.g. "STM8S103F3P6 STM8S development board" from your favorite China source
1 × Some headers, patchwires, breadboard etc (about $2.00)