At Introverts Retreat, we know how tough it is to select the perfect book for every introvert, so go on ahead and pick your book for your next box. Be sure to use the code sent in the info email, and the name and/or email of the box purchaser or box recipient so we can match the book with the box and ship them both to their new home! Not a subscriber? You can still buy books from us. In fact, we'll pay for the shipping to US and Canada.