You can download a PDF or EPUB version of Working with Stories for free. It is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License.
But please, if you find the book useful, consider making a donation (see below) or buying a print or Kindle copy. I put two and a half person-years into the book project, and that investment definitely wasn't free.
If you really can't pay (even the cost of a cup of coffee), pay it forward by using the book for something good. But if you can help out, I would appreciate the help very much. I'd like to keep doing this work!
And by the way, if you're looking for some help doing PNI projects, I offer coaching and support.