I ordered Pyrocat-HD from Photographers Formulary
http://www.photoformulary.com/DesktopDefault.aspx in powder form. Artcraft should be able to ship as well. I think they need to ship you a "kit", and not as separate chemicals. Won't be any difference for you, though :-D .
I suppose they could ship you PMK or some other pyro stuff the same way.
Photographers formulary sent the powdered chemicals in zip lock bags, something my chemist wife didn't like. The packet smelled and the catechol got a bit brown quite quickly (it worked fine though). If the mixing of dry chemicals isn't something you are interested in by itself, it seems better to order the glycol-version of Pyrocat-HD from Photographers formulary. That is what I will do when I run dry.
You might also consider Lotus Camera in Austria.
/matti