Open Textbooks can be listed in the University Bookstore.
OP 30.18: The Adoption and Sale of Textbooks and Related Materials
Texas Tech is required by statute to publish on the institution's website a list of textbooks to be used in all courses no later than the 30th day before the first day that classes are conducted for the semester. The official bookstore for Texas Tech publishes this information on its website on behalf of Texas Tech and provides this list to all local college bookstores. This necessitates that academic departments provide all textbook information to the campus bookstore no later than the 30th day before the start of classes. The official college bookstore for Texas Tech is the Barnes & Noble located in the Student Union.
An open textbook is an openly-licensed textbook offered online by its author(s). The open license sets open textbooks apart from traditional textbooks by allowing users to read online, download, or print the book at no additional cost.