Not just at the Kindle store. The eBook is also on sale at Apple Books, Barnes & Noble, BAM!, Google Play, and Kobo. They are all $3.99, same as the Kindle sale price.

I read this shortly after the Internet History Podcast episode with the authors. It is a good, detailed but bite-sized book. Very inspiring and very well written.

Annoyingly, that book has never had a Kindle edition available in the UK Amazon.