The issue I find with Montreal suppliers is their unwillingness to deal in small volumes.
For example, anachemia (where I get my p. dichromate, tea, sulfuric acid, etc) wants a $300 minimum order and insists on using a courier when it was only 5 minutes away. I have enough dichromate to do me a half a lifetime.
Looking at my comment about PF, it was about their on-line store. I get their products from BH.
As far as cost, my staples tend to be cheaper and less of a hassle from BH; assuming they can ship it.
does anyone know of a reasonable canadian source of CD-4?