Looks like Amazon has this book from MS Press for free. This is the updated RTM version of the book. The only catch is that it’s just for the Kindle. Which is fine, you can read Kindle books on your Windows Phone, or pretty much any iDevice, Android, and Blackberry. Or if you don’t have one of those (which I doubt if you’re reading this) there is always Kindle for PC. Or a Metro version if you have an RT.
Basically, you have no excuse not to grab a free copy of this book. So get it now while it’s still free.