Unicomp, for all their faults, has been really good at emailing me back , sometimes within the same day. Try them again or call the number.
I have had to order odd keycaps from them as well, some of which I just wound up spray-painting and using as blank modifiers.
I don't understand why they don't sell colored full sets of keycaps, since they do sell them individually. And why can't they update their website? It all just seems like extreme laziness and indifference.