There are plenty of products out there that cost less than $20, but most of them never get used. A USB drive that works in outer space? Can’t imagine a situation where that would come in handy unless perhaps you're Richard Branson. Are you Richard Branson? Anyway, here are 20 products under $20 that you will actually use every day. Need somewhere to put your headphones when you’re not using them? Of course you do.