Most everyone by now has heard of Owlcrate. In the event that you haven't, let me give you a little rundown of who they are and how they work.
Owlcrate is a monthly book box that deals mainly in young adult books and bookish awesomeness. Every month they have a different theme, i.e. Dystopia, Steampunk, fantasy, etc. They pick out a new release book and pair it with 3-5 bookish items that match that months theme. Owlcrate starts at $29.99 plus shipping. You can also skip months if you don't feel as if the theme is right for you, and if you miss a month you can go to their shop to purchase past months.
Here are a look at some of the past boxes that I opted in for plus my thoughts on each box.