What is an item below 100 bucks that everyone should own?

Keep one in your car as well. I've carried one over 15 years under my seat and had to use it last summer when a motorcycle attempted to overtake and hit a turning car. It wasn't fun but I'm glad I had it.

Every time I go to buy a first aid kit I realize I don't really know how to use anything inside besides like the bandaids and simple stuff.