You can search for used textbooks online by putting the ISBN or words from the textbook title in a search engine. You may find this to be somewhat time-consuming and frustrating. Results will vary depending on the time of year. Pay attention to the price---some online auction sites and used book sellers sell the used textbooks for more than you can buy them new! It is often hard to find used, complete matching sets of all the books needed. If you purchase them separately, be sure they form a matching set. Check the ISBNs against those shown when you click the appropriate link in the table on the Home page.