What are some examples of saltwater fish that are cheap and can be found in pet stores / aquarium shops?

I’m a father, godfather, brother, cousin, uncle, friend, neighbor, teammate, and co-worker. I am endeavoring to bring together a large body of helpful information on the subject of pets. I’m not shy, so you are invited to tell me what you think. Feel free to share and to disagree with me, but please keep it civil.