Riffle - Just good books and the readers who love them.
AbeBooks - AbeBooks has millions of new & used books, rare books and out of print books.
Readernaut - We are a small community of readers, sharing our adventures and supporting each other as we persue a life of learning.
DealOz.com - Save time. Save money. Discover. Search new and used books, textbooks, and ebooks using the most trusted shopping comparison site, DealOz.com.
LibraryThing - A home for your books.
Bookfinder - Find nearly any book: new, used, rare and textbooks.