This LED panel controller can be found for $15 on AliExpress: https://github.com/q3k/chubby75 https://github.com/q3k/chubby75. It has a pretty decent Spartan 6.

This LED panel controller can be found for $15 on AliExpress: https://github.com/q3k/chubby75 https://github.com/q3k/chubby75. It has a pretty decent Spartan 6. Your best choice if you want current commercial availability. The eeColor Color3 can still be bought on Amazon for $20. https://github.com/tomverbeure/color3 https://github.com/tomverbeure/color3. It has a very nice Cyclone IV FPGA and is perfect for HDMI video. It was very popular for a while for bitcoin mining because you could get it for $20... with a $20 rebate! (https://www.amazon.com/Color3-Advanced-Processing-Device-010000-002/dp/B00BUUV4X6 https://www.amazon.com/Color3-Advanced-Processing-Device-010...)