I have a copy of Nigrini's book. I've tried getting copies for my company, but other than the occasional $200+ used copy on Amazon, it appears like this book isn't just "out of print" but withdrawn from the market (the publisher sells training now, not books that anyone can read).

http://www.amazon.com/Digital-analysis-using-Benfords-Law/dp...

http://www.nigrini.com/data_analysis_books.htm