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Are these vintage or reproductions? Are they readily available for sale?
If you want, Unicomp offers 1x1 keycaps in all colors. Not just the escape.
The only trick there is to it, is that their shipping is expensive. So don't buy 1 keycap. It'll cost you $9+1.30. Decide what you want, along with your friends, and make all purchases in one shot.
Another trick is to dye your keycaps. I have plenty of success with them and will never buy colored keycaps ever again.
In fact I strongly advise you to dye your own keycaps. Their price for RGB is ridiculous. I think I spent less than that for half a dozen packets of dye.