Tractor Supply sells them by the pound, but I can't speak to the quality. Never bought any there. A lot of nuts and bolts that are marked as a grade 5 or 8 might not actually be of that grade if they are coming from a 3rd world nation. If you want quality, then stick with the companies that supply industry. Every major city should have one listed in the telephone book under "Industrial Suppliers". It will cost more, but you will be sure of the quality. If you don't care about quality, then buy them based on price.