Mechanical keyboard keycap sources?

Diving down the mechanical keyboard rabbit-hole to make a couple projects.

Does anyone have good sources for keycaps? @mcmancuso ?

I’m specifically looking for “windowed” caps - using surface mount leds under the switches. And then I’m interested in multiples of the same cap rather than a “keyboard set”

I’d also be interested in recycling old/unused caps if someone has any they want to get rid of.

At my old makerspace we had a couple go down the mechanical keyboard rabbit hole and started to resin caste their own key caps. Even had a vacuum chamber to help in the resin processing. Turned out really nice.