This might fit into edge cases. I've used McMaster-Carr as a consumer many times, and though I might get a discount if I bought a minimum quantity, I've been able to purchase what I needed in singles each time. I doubt if there's an e-commerce site out there that will let you purchase and ship 4 screws for less than what you would pay for 200. Even at brick and mortar hardware stores you're ripping yourself off by buying 50 screws instead of 200 (or 1000). I get that you don't need them all but the price per unit is still astronomical.
