Founded in 1997, BookFinder.com has become a leading book price comparison site:
Find and compare hundreds of millions of new books, used books, rare books and out of print books from over 100,000 booksellers and 60+ websites worldwide.
Independent Scholar's Handbook:
This book is, without question, the most valuable work around for those who pursue an interest in a serious, systematic way. Completely revised and updated by the author, the handbook points to resources, organizations, and people, and helps the reader to understand the development and use of such expertise. [via]