I subscribe to
Numismatic News which is part of Krause Publications. They sent me a survey the other day and you can get a 25% discount on coin and paper money books if you complete it. The survey is open to the general public, you do not have to subscribe to anything.
Books by Krause which you may be familiar with are the World Standard catalogs, United States Tokens, and many more. The discount code is good through 12/31/08 so enjoy
