Prior to the Internet and eCommerce capabilities, college students had limited choices when it came to obtaining their textbooks: they either bought textbooks and course materials from the campus bookstore or they went without, the latter a somewhat unlikely choice given the relative affordability of textbooks in the past.
Fast forward to more recent history and, while most students can still buy from the campus bookstore, off-campus retailers like Amazon, eBay, and other platforms have captured more and more textbook sales by offering students lower prices and more convenient shopping options.