actually they are not for sale, they come as custom made dura ace hubs by Dreamworks Mr. Adachi.
the good thing is, everyone can have them. well, if you own dura ace hubs... (credit to Mr. Adachi who told me how)
remove the plastic caps with a knive (gentle they are glued on) get rid of the black paint with fine sandpaper and paint/design them how ever you like...
^ Yes, as described in the comments here: http://fixedgearbikes.blogspot.com/2009/08/dura-ace-track-hub-dust-caps-in-colors.html