Digital BW, The Print

Is anyone using an Epson C82 with quadtone B&W inks?  I've searched 
the archive, and some of you seem to be using it, but I can't seem to 
find a place on the web to buy empty cartridges.  MIS doesn't appear 
to have cartridges yet.  Any advice on where to find the cartridges 
for filling with quadtone inks?

Thanks for your help.

-Ed