I rarely go in a TSC but I have found plow bolts when the staff said they didn't have them. There were bins of bolts in the area where they sold PTO shafts and such. You would think they would be with bolts or similar but they weren't. I haven't been in for a year so things may have changed but they were always hard to find. I don't bother asking questions.
They had a nice selection, were USA made and coated in oil. Surprisingly, you can also special order tillage shovels and such, including odd sizes, from them and I've done it. It seemed much higher in price so I've learned to like standard sized things sold by Shoup, Sloan Express, Agri Supply or Rural King. If you're going to buy enough cultivator shovels or whatever, you can sometimes buy direct from the manufacturer. There's a couple in he midwest that seem to make almost all of the domestic supply.