Book Mail by Book Riot
Book Riot previously had a subscription with Quarterly Co, but they now have their own regular "mystery box" called Book Mail!
"Get books and bookish items hand-picked by Book Riot, exclusive content from authors, and first crack at new items in the Book Riot Store. A new Book Mail box will be available every few months, and the contents will be a secret! (Decoder ring not included.) Does not contain any repeats from Book Riot's Quarterly or YA Quarterly subscriptions."Subscribe