Try Google Book Search.

Marketing Tip: Google is testing a new program called "Google Book Search," which uses Google's powerful search engine to help people find the books they are looking for and where they can be purchased. While you should not confuse Google Book Search with marketing, it is a useful marketing tool that you would be well advised to use if you can. There are restrictions. For example, you need to be the rights holder to the book in question, which should not be a problem for self-publishers; have an ISBN number and a bar code; and a way that people can order your books. The Publishing Pro, LLC