The textbook for The Mortgage Encyclopedia by Jack Guttentag is widely available — you need not purchase it from Amazon. 

BookFinder  lists dozens of online new and used book stores which sell The Mortgage Encyclopedia.  The prices quoted include shipping.

Amazon offers used copies of the book and a version you can download to its proprietary eBook reader, the Kindle.  It also offers an online version of the book for just $2.⁰⁰ but to get it you must purchase a new paperback edition of the book for about $15.⁰⁰.

Google Books  lists dozens of online book stores which sell The Mortgage Encyclopedia.  Some of the book stores it lists sell copies for much less than Amazon (be sure to check out delivery costs and taxes before committing to buy any book).  You may also use Google Books to search for available copies of The Mortgage Encyclopedia at your local public library.  Finally, Google Books provides an online preview of the book's first 100 pages.

If you don't mind purchasing a used copy, you will find many cheap copies at www.Alibris.com, www.AbeBooks.com, and eBay.

The eBookMall sells The Mortgage Encyclopedia in PDF format for $19.⁹⁵ (as of 06/10/2008).  Their version offers "advanced navigation, search, and bookmarks."  Go here to see eBookMall's entry for this book.

Finally, most major book stores (e.g., Barnes and Noble) carry the The Mortgage Encyclopedia  in stock.