I used to get mine from IOS (link), on a small MCPCB suitable for my purposes. However the last two I got from there had a cool white die and I was told there are only CW in stock (even though the description still says NW).
So any suggestions about where I can get XM-L Color LEDs with NW on a 16mm MCPCB (or LED and board separatly) for a nice price currently?