The company behind the Rock Pi 4 is back, this time with a tiny SBC powered by a Rockchip RK3308 quad-core SoC. The board comes with either 256 MB or 512 MB RAM, a built-in voice activity detector (VAD) along with a host of ports and connectors. The Rock Pi S measures just 3.8 x 3.8 cm will sell for US$9.90.
https://www.notebookcheck.net/Rock-Pi-S-A-US-9-9-Rockchip-RK3308-powered-SBC-that-is-tinier-than-a-Raspberry-Pi.424900.0.html