Sanwa OBSF-30 Mismatch Colors?

I wondering if you guys knew a place I could order some Sanwa OBSF-30 (silent ones would be even better) that I could mismatch some of the colors around. I've seen the black rims with different button tops but what I was really interested in was getting White rims with Blue tops. Did you guys know of any places online I could work this out? It would be a big help to point me in the right direction instead of going through the time and money of buying 2 sets of 8 buttons just to switch them around.