As Good as It Gets is available at all major online book stores.
The book can also be purchased online.
Amazon Kindle:
The Amazon Kindle Edition is available for $9.99. You can purchase the Kindle edition on Amazon here: http://www.amazon.com/dp/B007JWIJ96
Wipf & Stock Publishers:
The best price for the book is presently found at the Wipf & Stock web site:
http://wipfandstock.com/store/As_Good_as_It_Gets_Love_Life_and_Relationships_Fifty_Days_in_The_Song_of_Songs