This week's book giveaways are in the Refactoring and Agile forums. We're giving away four copies each of Re-engineering Legacy Software and Docker in Action and have the authors on-line! See this thread and this one for details.
The Programmer's Guide probably goes into a lot of depth on that. USD 50 doesn't seem much for such a specialized library, and it actually saves your company money if it even saves you as little as 2 hours time.