Baen's standard setup is based on monthly bundles. Each month, whichever books Baen has coming out in paper (paperback or hardcover, new or reissued) are bundled put together in a fixed price (currently $18) bundle regardless of a number of books (historically 4–9 books, average 5–6). The "Monthly Baen Bundles" are released in installments beginning three months prior to physical publication. The first installment, released three months prior to paper publication includes roughly a half of every book in the bundle, with some books usually included in their entirety. The second installment, two months prior to print publication includes roughly three quarters, and the third installment on the 16th of the month prior to official print release includes the full text. The first two installments are generally available only as HTML, while the last includes all formats supported. Each bundle can only be bought until the 15th of the month prior to official print publication, which is about the time the printed books reach retailers. (Until December 2012, bundles remained on sale indefinitely.)