I needed a wing nut for a battery post on my boat.  I checked out the prices for one and considered having to drive somewhere to find it being sold and decided to just order an offering of several sizes I might need in the future.  Is that economically wise?  No, not really, but I will someday need another several wingnuts and if I can find them in my garage, I will be ahead of the game. I know they are made in China, so that cost this offering a star, that's just me.