It is available as a free PDF or a low-cost paperback.
Here's an excerpt from the announcement:
This book reports on a comprehensive analysis of serious open access journals as of December 31, 2015: nearly 11,000 journals in the Directory of Open Access Journals. For 10,324 of the journals, the study includes whether or not there's an article processing charge (APC), how much it is, and the number of articles in each year 2011 through 2015. The state of serious gold OA is described in terms of article volume, fees and revenue, subject segments, regions, type of publisher and other aspects. The book includes two chapters on the May 2016 "delisting" of 2,900-odd journals.
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