Bookboon, the College Open Textbook Collaborative, or Project Gutenberg may have the textbook required available for free online, suggests Dian Schaffhauser of Campus Technology. To locate a textbook for purchase online, Bookfinder offers a textbook ISBN search that allows the user to price compare textbook prices from several online retailers.
Locating a textbook available online at no cost is generally dependent on the course professor using an open source textbook program like the College Open Textbook Collaborative, explains Schaffhauser. The content available through open source collections is limited, often to a few subject areas such as economics or life sciences. Other sources, such as Bookboon, offer a selection of textbooks free online in exchange for selling advertisement space on the page. Students enrolled in literature courses are wise to check Project Gutenberg for required reading. The site offers a wide range of literature classics free online.