I bought a copy of MagiC from chro_MAGIC (what strange caps..) a couple of years ago with no problems. Check out http://chromagic.digistar.com/ .. but do note that the website hasn't been updated in over a year and that their online catalogue no longer lists MagiC. The one and only guy running the business was quite friendly and answered all my questions thoroughly and promptly so I'd say it's worth checking to see if he's still got any stock left.
I've heard good things about Systems For Tomorrow, but that was two years ago when their online catalogue worked. :) They seemed to have outsourced that now and it's 404s all the way. A real shame.. where to buy MagiC in North America aside from the used market? ASH? Hello? Wake up..