If there is a commercial or professional processing laboratory in your area, give them a call. You most probably will be able to get what you are looking for, gratis. Large labs will go through miles of bulk film, usually for slide dupes. The cans and bags, and sheet film boxes, are often considered a nuisance, to be dumped in the nearest recycling bin.

However, the real problem is finding a commercial or professional processing laboratory which is still in operation...