Well Dave, what does it matter where the parts supplier is when these days people buy on line? Back in the day they were all over, but when things started drying up there was this guy a few miles north specializing in surplus stock, and another a few miles west with row upon row of stuffed parts bins and a shop in the back repairing Tektronix scopes. The techie was all upset he couldn't get a certain replacement transistor, a couple of minutes later I handed him a generic from his own stock. He asked how i knew that, I told him I used to be an engineering assistant at a sorting house. Transistors come in 55gal fiber drums untested and unbranded, they go down a line of sorting stations that test them and when one matches the programmed curves it goes in a drum for numbering and branding, those that don't get passed down the line. At the last station it's pass or fail, pass go in one drum to be numbered and branded, fail get ground to powder and recycled. Yeah, you can have a dozen brands and numbers all for the same transistor.
That having been said, there is always good old reliable Mouser Electronics:
https://www.mouser.com/ That's just one off the top of my head, surely there are others when you type "acetate capacitors", Mylar capacitors", or whatever fancy dielectric comes to mind in your favorite search engine. For what its worthless I use Startpage HTTPS with Duck Duck Go as backup, I value Internet privacy. I am disappointed this connection is not secure, they seem to be dragging their feet with upgrading to SSL.
