If you are on LinkedIn, join the Sage Timeslips Users group. You should see an Active Discussion showing the "For Dummies" link to the Sage website where you can reserve your copy. There is no charge for the book and it is not available in stores. Sounds like a good deal!
Timeslips 2013 has some important updates in the lastest service release, which is now available for download. If you did not receive the download information from Sage, click here to be connected directly to the download website.