Here[1] it is on Amazon, which is cheaper, and seems to have used copies for ~$18, but I can't find anything for $5. Maybe it was a typo?

1: https://www.amazon.com/Specification-Example-Successful-Deli...

I'm guessing this one (with a slightly different title: Bridging the Communication Gap: Specification by Example and Agile Acceptance Testing) http://a.co/d/6tGlrUc