Best Book Deal  
   Compare prices at 47 online bookstores. Calculates tax and shipping cost.
   http://www.bestbookdeal.com/

ISBN.nu  
   Compare prices at several online bookstores by ISBN, author, or keyword.
   http://www.isbn.nu/

AddAll  
   Compares prices among 41 on-line bookstores, including used and out of print titles.
   http://www.addall.com

BookFinder.com  
   Book shopping search engine, plus a meta search of 12 directories of used, rare, and out of print booksellers.
   http://www.BookFinder.com

AllBookstores.com  
   Compare prices at over 30 online bookstores by title, author, ISBN, or keyword.
   http://www.allbookstores.com

Compare Shop Books  
   Gathers prices from about eight booksellers.
   http://www.CompareShopBooks.com

Campusi  
   Pricing search engine reviews over 40 online stores for new and used books, and locates coupons if available.
   http://www.campusi.com/

Any Book For Less  
   Compares prices at 22 online booksellers, including delivery to US, Canada and UK.
   http://www.anybook4less.com

Priceviewer.com  
   Searches and compares prices among 47 book stores worldwide.
   http://www.priceviewer.com

BookHQ  
   Provides free listings, and searches new and used prices from ten bookstores.
   http://www.bookhq.com/

Campus Books  
   Compares prices and availability for new and used textbooks.
   http://www.campusbooks.com/

FetchBook.info  
   Compares new and used prices among multiple book stores.
   http://www.FetchBook.Info/

Bookchecker.com  
   Finds and compares prices for shops in several countries.
   http://www.bookchecker.com

Fast Book Finder  
   Searches by title, author, or isbn and compares prices among online booksellers.
   http://www.fastbookfinder.com

AAA Book Search  
   Compares prices at 44+ online bookstores.
   http://www.aaabooksearch.com

The Cheapest Book  
   Searches US online bookstores and compares prices.
   http://thecheapestbook.com/

Bookfinder4u.com  
   Compares new and used book prices at online stores.
   http://www.bookfinder4u.com/

Price Owl  
   Searches book stores and lists prices.
   http://www.priceowl.com/

BookOwl.com  
   Searches bookstores and compares prices including sales tax and shipping.
   http://www.bookowl.com/

BookButler  
   Compares prices at up to 40 stores.
   http://www.BookButler.info/

AllDiscountBooks.net  
   Compares prices from online retailers in US, UK, and Canada.
   http://www.alldiscountbooks.net/

Power Book Search  
   Performs price comparisons of online retailers.
   http://www.powerbooksearch.com/

GetTextbooks.com  
   Price comparison search engine.
   http://www.gettextbooks.com/

Bookkoob  
   Compares prices at US and UK online stores.
   http://www.BookkooB.net/

Abookbargain.com  
   Compares prices of books including shipping costs.
   http://www.abookbargain.com/

BookCost.com  
   Compares prices at several online retailers, and displays current coupons available.
   http://www.bookcost.com/

Get Cheap Books  
   Searches and compares prices at eight online bookstores. Includes used and out of print titles.
   http://www.getcheapbooks.com/

Book Squirrel  
   Provides price comparisons including availability as well as shipping and sales tax calculator (based on zip code).
   http://www.booksquirrel.com/

Saveonbooks.co.uk  
   Compare prices from UK online bookshops.
   http://www.saveonbooks.co.uk/

FindUsedBook.com  
   Metasearch online used book retailers.
   http://www.findusedbook.com/

Chambal.com  
   Compares prices across online bookstores.
   http://www.chambal.com/