Each publisher of college textbooks shall make available to a prospective purchaser of the publisher’s products who is a member of the faculty of an institution of higher education (1) the price at which the publisher would make the products available to the store on the campus of such institution that would offer such products to students, and (2) the history of revisions for such products, if any. For purposes of this section, “products” means all versions of a textbook or set of textbooks, except custom textbooks or special editions of textbooks, available in the subject area for which a prospective purchaser is teaching a course, including supplemental items, both when sold together with, or separately from, a textbook.