Web Search: In reply to your e-mail
The article contains comments from several different people about different web services. Near the end of the article is this entry:
Finally, Betsy Sundquist says she has found a book price-search site that she likes better than BookFinder (www.bookfinder.com), which I recommended: Fetch Book (www.fetchbook.info).
"It seems more user-friendly to me," she says, "and I think it searches more sites."
I do a lot of book buying and Fetchbook is also my preferred book comparison site.