McMaster Carr
I ordered thirty ten-packs of a tiny set screw and there was a misunderstanding on their end and they sent me, three packs or thirty screws total. Called on Monday afternoon and the nice lady apologized and said you'll have the 27 packs tomorrow. She did not lie, they were here Tuesday afternoon. McMaster is one of the few good supply companies left. Fastenal can suck eggs. I was standing in their store and they refused to sell me two set screws they had in stock, because the total was less than $25. With a straight face the guy said it cost too much to process a small order. I walked out and will never return. Nor will the ~$12,000 my department spent per year with them. I've sent the business to McMaster and others.