Froogle:
Developed by Google, Inc. One of the most promising price comparison sites to date.
BizRate:
One of the largest price search sites. Over 30 million products listed.
Shopping.com:
Child of Dealtime and Epinions, now merged to provide you with three shopping search engines that feature your products separately, yet the same.
Yahoo Shopping:
Complete Yahoo Shopping data feed creation and maintenance solutions.
MSN Shopping:
Complete MSN Shopping data feed creation and maintenance solutions.
NexTag Shopping:
Complete NexTag data feed creation and maintenance solutions.
PriceGrabber Shopping:
Complete PriceGrabber data feed creation and maintenance solutions.
ABooksearch.com
Searches databases of participating booksellers.
ChooseBooks
Search for used, out-of-print, and rare books from many dealers.
Used Book Central
Searches the stock of affiliated dealers in the US.
Cover to Cover Antiquarian Books
Offering a range of antiquarian, second hand and out of print books.
Bookquarters.com
Comparison search capabilities for finding rare, used and out-of-print books from many independent sellers.
Big Words
Compares textbook prices at four stores - buying or selling.
Used Book Search
Search for used, rare and out of print books.
Biblion.com
Antiquarian and rare books from primarily UK book dealers available on a searchable database.
Biblio.com, Inc.
Searches databases of associated independent booksellers worldwide.
Biblio Direct
Used/out-of-print book buying directly from dealers.
More Search, On-line Sites