FYI
I restore old engines to running and/or collectable condition. I have had problems finding small quantities (100 or so) of fillister head, black oxide screws to match the originals used when the engine was built. Most vendors have quantity requirements of 1000 or 10,000 that I don't need.
I finally found a vendor selling in smaller quantities just about any type screw I could come up with. Another restorer and I went together and stocked up our parts bins, sharing the costs.
Check this site out: http://www.aaronsmachinescrews.com/
Hope this helps.
Lee
MECA 5575-11