I thought I would post a link to a company in Surrey, B.C. that sells a number of chemicals useful to alt processes, including silver nitrate, gelatin, potassium bromide and iodide, potassium ferricyanide, ferrous sulfate, denatured alcohol, ether, sodium thiosulfate (and probably a few more). Also sells a great amount of useful lab ware.
I asked the proprietor if it was OK to post the link to the business; he said great. He seemed keenly interested in the alt processes when I explained what the chems were all for.