Heretofore, I had been buying small hardware at my local hardware store. But, I'm building targets and need a lot of little 10x28 screws to put a target together. (Each target takes 6 screws)
So, yesterday on my break I popped into Fastenal to see if I could get a bulk deal. Yowser! I picked up 200 machine screws with nylock nuts for less than I'd pay for a dozen of the same screws at my local hardware store. They didn't have any socket knob screws in stock, but they can order them a heck of a lot cheaper than I can get them at the hardware store. They'll be in Monday, and I'll pick them up after work.
I"m quickly becoming a fan of Fastenal.