I love Abebooks, but it took awhile to get the "hang" of the site, simply because you cannot generically "shop" all the sellers. My criteria is no ship chg/hardbound only/and no library books. That being said, i initially purchased from all over and got wrong titles, books in poor condition, and SLOW shipping! I now order from two sellers exclusively, simply because the service is amazing and the shipping fast. You must pay attention to who you are buying from-what is the "rating", what is the book condition, what edition is it, publisher etc. Do your homework! I order between 15-20 at a time, and since i started using these two sellers i have had NO problems. Steer clear of overseas sellers and try to stay with sellers in or near your own state. Once i started paying attention i was so much happier! (i owned a used bookstore, and i was special orders clerk at Borders-17 years, so i have some idea of used books!)