Looking for a rare edition of your favorite novel or a gently used copy of a childhood favorite? Use the power of the Web to scour the dusty bookshelves of hundreds of booksellers in an instant. Whether you're looking for a cheap paperback edition to throw in your beach bag or a signed first edition to put on display, put these sites on your list of must-shop sites:

• Alibris specializes in hard-to-find books, including out-of-print and foreign-language titles.
• Advanced Book Exchange is another great way to access over 9,000 independent dealers of used, secondhand, rare, and out-of-print books.
• In conjunction with Amazon.com, Bibliofind is sure-fire tool for your next used book treasure hunt.