Book Off (ブックオフコーポレーション Bukku Ofu Kōporēshon) (TYO: 3313) is Japan's largest chain of used bookstores. Founded in August 1991, the company has had explosive success, expanding to 866 stores throughout Japan and eight overseas locations (as of August 2006). In addition to books, its chains also sell manga, CDs, DVDs, video games, and even used video game consoles, mobile phones and portable media players. The stores are distinguished by their large surface area, cleanliness and bright illumination.