| Abebooks | Search the inventories of many booksellers for out of print material and used, rare, and antiquarian books. |
| Alibris | Search for and >40 million used, new, and out-of-print books. Also search for movies and music. |
| AddAll | Search and compare prices at 20,000 booksellers. |
| Amazon Books | Search millions of new, used, electronic, and rare books. |
| Antikbooks | Find antiquarian bookstores, antiquarian books and antiquarian book fairs in Montana and around the world. Also includes links to publishers, book repairs, etc. |
| Backinprint | Order author's personal copies or on-demand books of out of print books by over 7,500 authors. |
| Barnes and Noble | |
| Best Book Buys | Search for new and used books, textbooks, audiobooks. Compares prices at independent and chain online bookstores. Your search will show whether a book is in stock or backordered, how soon it will be shipped, and the approximate shipping cost. |
| FetchBook | Compare prices at 109 bookstores. |
| Great Northwest Bookstore | Western literature and American are the specialties of this Portland site, with over 195,000 books in stock. |
| Hamiltonbook.com | Remainders, cutouts, etc. |
| Harvard Book Store | Specialties in scholarly and business titles, but also includes general interest information. Winners of literary prizes. |
| ISBN.nu | Compare the prices of in-print and out-of-print books at online bookstores. Search on the title, author, or subject. |
| Powell's Books | Over a million new and used books in stock daily. |
| Tattered Cover | Denver bookstore. |