Now that the Videos are Free on Youtube, the Challenge Workbook is available to purchase on it's own! (This workbook is not meant to be used on it's own, but in conjunction with the videos of The 60 Day Novel Writing Challenge, which is why it was never sold separately in the past.)
 
The Challenge Videos can all be viewed for free here: https://www.youtube.com/playlist?list=PLrZEwww3l6nJGPdntpu7UbQmtvthlGUMc