I found a mini-keyboard from dealnews.com for $20 with multicolor LEDs, that seems reliable.

I found another at Best Buy with red LEDs, but otherwise similar, and I gave it to my coworker. He wore all the letters off the keycaps before he retired and took it home, but it was otherwise reliable.

I think these were both blue switch-based.

Several genuine Cherry keyboards were in the e-waste pile at work, so I rescued them. I am using one on a test PC with rhel8.

https://www.dealnews.com/Redragon-S107-BA-Gaming-Keyboard-an...

https://www.dealnews.com/Aula-F75-Gaming-Mechanical-Keyboard...

https://www.dealnews.com/K4-RGB-Tenkeyless-Mechanical-Gaming...

I wish that Cherry could get a cut of these.