The required textbook for the Options, Futures, and Other Derivatives (Finance 4366) course at Baylor University (coincidentally) shares the same title as the course. Authored by University of Toronto finance professor John Hull, the “Options, Futures and Other Derivatives” textbook is now in its 10th edition, and it is very expensive; indeed, the campus bookstore currently offers used copies for $263, and new copies for $350.50 (see http://bit.ly/4366text). Prices on Amazon are (not surprisingly) lower; e.g., as of December 2, 2019, new copies of the book are listed for $219 and used for $111.
Although I list the 10th (US) edition as “required” for Finance 4366 in the course syllabus, you are welcome to rely upon earlier (typically used and considerably less expensive) editions of this book; e.g., the 7th, 8th, and 9th (US and international) editions are completely acceptable substitutes, since the chapters that we cover in Finance 4366 are virtually identical across the 7th through 10th editions. Just make sure that the book author (John C. Hull) and title (Options, Futures, and Other Derivatives) are the same, that the edition of the book is no earlier than the 7th edition, and that you are buying the textbook and not the solutions manual or instructors manual.
Finally, don’t worry about whether the book you buy or rent includes the “Derivagem” software. Derivagem is an Excel spreadsheet template which you can download from the course website.