One of my favorite things in my Spanish 1 class is implementing Free Voluntary Reading time (FVR) aka SSR. It is probably the most important thing we do in class. If you need convincing of that, then you need to read The Power of Reading by Dr. Stephen Krashen or read any of his free articles about the topic.
Many teachers are overwhelmed by the number of choices. If you are able to, start building your library. Whatever you can get your hands on. Buy as much as you can each year if you have department money or write whatever grants you can. In the meantime, I can going to post my personal favorites.
Again, these books are the ones that appeal to me or to my students. I encourage you to share your own lists of your favorites. (Pssst…That’s the best part about free reading is that students have a choice!)