I tried something by myself.
I ordered blank dice. Red, yellow, green and blue.
The cost 4€ for each pack of 25 dice.
I drilled holes into the surface.
1 hole into 1 side of the reds, 2 holes into 2 sides of the yellows, 3 holes into 3 sides of the greens, 4 holes into 4 sides of the blues. Yes, that were 750 holes.
After that I “borrowed” some black nail polish from my wife and filled the holes.
Next day I cleaned the mess with nail polish remover.
This strategy is a bit easier for new players. You dont have to remember the correct colour. Just take the dice with the 2 dots per side if you need “2-dice” …