GD32VF103 chips are similar to STM32F103s and you can get boards with them for ~$5: https://www.seeedstudio.com/Sipeed-Longan-Nano-RISC-V-GD32VF103CBT6-Develop

GD32VF103 chips are similar to STM32F103s and you can get boards with them for ~$5: https://www.seeedstudio.com/Sipeed-Longan-Nano-RISC-V-GD32VF103CBT6-Development-Board-p-4205.html https://www.seeedstudio.com/Sipeed-Longan-Nano-RISC-V-GD32VF... Kendryte K210 modules are a bit more expensive, but they include an "AI coprocessor" which looks like a sort of SIMD accelerator. They come in creepy "camera+wifi" form factors for all of your dystopian facial recognition needs: https://www.seeedstudio.com/Sipeed-M1w-dock-suit-M1w-dock-2-4-inch-LCD-OV2640-K210-Dev-Board-1st-RV64-AI-board-for-Edge-Computing-p-3207.html https://www.seeedstudio.com/Sipeed-M1w-dock-suit-M1w-dock-2-... And if you're willing to spend a bit more, SiFive also sells "Freedom" boards which are more like SBCs than microcontrollers: https://www.sifive.com/boards https://www.sifive.com/boards