One advantage to living where agriculture and oil are big business is there's a local vendor, Budget Bolt. Open M-F and a half day Saturday, same hours as my favorite steel vendor and on the same street. About two acres of fasteners, very neatly organized, and very helpful staff. Everything from automotive specialty fasteners to turnbuckles to shackles to spring clips, and bolts from tiny to huge, SAE and metric, stainless, and taps, dies, and QUALITY drill bits. Every time I go in there, I find something else I didn't know I needed. They're not cheap, but their products are excellent quality.