Phoned in my order to the local Fastenal (located 6 blocks north of my QTH) on Monday. They didn't carry small pattern nuts so those were ordered. They arrived today. I got 70 x 6-32 x 3/8" slot-drive pan head screws, 70 x small-pattern (stainless) hex nuts and 20 x regular steel/zinc plated nuts. Total cost $10.60 including S&H for the small-patterns and tax. That's $9.05 for the hardware. The guy I worked with learned something new: the difference between standard and small-pattern nuts. I can live with that!
I also found they are carrying electrical supplies, paint and all sorts of tools. Menard's and ACE, eat your collective hearts out. I'm a happy camper.