I've been looking for a cheap FPGA dev kit to teach classes with - pref something in the $20 range - I just got one of these to play with, haven't had time to

I've been looking for a cheap FPGA dev kit to teach classes with - pref something in the $20 range - I just got one of these to play with, haven't had time to do anything with it yet https://www.seeedstudio.com/Tang-Nano-9k-FPGA-board-Gowin-GW1NR-9-FPGA-8640-LUT4-6480-flip-flops-p-5381.html https://www.seeedstudio.com/Tang-Nano-9k-FPGA-board-Gowin-GW...