We first found out about GigaDevice GD32V 32-bit RISC-V MCU last summer, as an update/alternative to the earlier STM32 compatible GD32 Arm Cortex-M3 microcontroller from the company with higher performance and lower power consumption, while keeping the price identical.
The first low-cost GD32V development board we covered was Longan Nano going for $5 with an OLED display and an acrylic case. If you don't need either or want to access all pins from the 48-pin MCU, you can now order an even cheaper GD32V RISC-V MCU board with Polos GD32V Alef going for $2.99 on Analoglamb website.
Polos