A 3,333-page patent.
United States patent number 6,314,440, Pseudo Random Number Generator, is a bargain for those ordering patents from the USPTO’s web site. For only $3, you get a whopping 3,333 pages, including 116 columns of specification and 3,273 pages of drawings! That’s only 0.09 cents per page! If you prefer PDFs, this one is a whopping 317 MB!
http://www.uspto.gov/main/patents.htm