As mentioned by jnanian http://www.khbphotografix.com/ here in Canada is really good (sales service parts advice)and I have e-mailed back and forth with Harry at http://classic-enlargers.com/. He was most helpfull too.
For all the little extras (lensboards, lenses (lensi?) neg carriers, filters, etc, etc) ebay comes in pretty handy if you don't mind waiting. Parts are not too hard to come by (in my experience anyway).