According to Wikipedia...
As of November 2009, the English version of The God Delusion had sold over 8.5 million copies and had been translated into 34 other languages.It was ranked #2 on the Amazon.com bestsellers' list in November 2006. In early December 2006, it reached #4 in the New York TimesHardcover Nonfiction Best Seller list after nine weeks on the list. It remained on the list for 51 weeks until 30 September 2007. It has attracted widespread commentary, with several books written in response.
Around 4 million copies have been sold
4.5 million copies of Eclipse have been sold.
1000 copies have been sold
320,000 copies sold as of now
100,000,0000 copies were sold!
For each book over 1 million copies have been sold.
there have been over 20 billion copies sold i work with the processing
In the United States it has sold 12 million copies.
probably over 2.5 million copies sold
17 million copies have been sold
Over 500,000 copies of Nightmare have been sold as of 2011.