Here's an update on the search for fine silver granules. I am happy to report that I have found a source! Scientific Alloys Corp., Phone: (973) 864-3160 ; Email: Sales@scientificalloyscorp.com.
I had made up my mind that I would have to spend the time making the small granules I use, and checked one of the sources, as a last resort, that was suggested on Orchid in response to my request. That source sent me to Scientific Alloys and I couldn't be more pleased with the response. They have no minimum order, which, as a one-person studio jeweler, was very important to me.
Thank you everyone for your suggestions and sources. It's been a lengthy search, but, due to Orchid, sort of indirectly, success has been achieved.
BTW, I believe that S.A.C. is about to join our ranks on Orchid, so look for their info right here in our community.