One of the two ULP (Ultra Low Power) co-processors on ESP32-S2 chips is based on RISC-V. Boards using ESP32-S2 are available for relatively little, e.g. see htt

One of the two ULP (Ultra Low Power) co-processors on ESP32-S2 chips is based on RISC-V. Boards using ESP32-S2 are available for relatively little, e.g. see https://www.mouser.com/ProductDetail/Espressif-Systems/ESP32-S2-Saola-1R/?qs=GBLSl2AkirsMIxW%2FKjKKRw%3D%3D https://www.mouser.com/ProductDetail/Espressif-Systems/ESP32.... It's admittedly a niche use-case but it's an option for playing with RISC-V hardware...