Try independent bookstores first, but it is on Amazon.
Out of all of the self-help, self-growth, self-improvement, self-whatever books I've read this year, none have impacted me as much as this one. The author defines the difference between a change (it is "situational; it is the external event that is taking place") and a transition (the "inner psychological process that people go through as they internalize and come to terms with the new situation that the change brings about"). Therefore, what we think of as an ending is really the next beginning. Radical! Reading this book helped reframe my perspective on the recent changes and more long-standing transitions I've been experiencing — I feel a lot less lost and more settled in my continuing uncertainty.