Good source for good books

Was doing some reading on Lucene, which is an amazing open-source search engine, and was pointed at the book “Managing Gigabytes” from the lucene project’s wiki. So, I looked up the book on amazon and was delighted to find a review of the book by Peter Norvig. From there I looked at all of the other books that Peter Norvig has reviewed on amazon. A really good reading list for twisting your brain around.
Was looking to pick up a copy of “On LISP: Advanced Techniques for Common LISP (Textbook Binding)”, but the only purchase options are to buy used and the starting price is $234.
Books that I am picking up:

    Neural Networks for Pattern Recognition by Christopher M. Bishop
    Managing Gigabytes: Compressing and Indexing Documents and Images (The Morgan Kaufmann Series in Multimedia and Information Systems) by Ian H. Witten