Try looking for it at staples. They have pretty much every ink and toner cartrige you could find and at a reasonable price most of the time. Or try searchin on <A HREF="http://www.google.com/froogle?hl=en&tab=wf&q=" target="_new">Froogle</A>, that thing is actually fairly helpful.
<A HREF="http://www.folken.net/myrig.htm" target="_new">My precious...</A>