Ebays your best chance, but be prepared to get into a bidding war just for a used one. Hozan only makes bicycle stuff now. I looked a while back and all that stuff is very hard to find. I did manage to find some rolling heads from
http://www.britcycle.com/ but not Hozan. They are the 'Cyclo england' rollers. I think i bought the last rolling heads in 9G they had. Last time i checked they still had some hand rollers and rolling heads in some gauges but they didn't have much left.