It looks like Ben Shapiro's book "How to Debate Leftists and Destroy Them: 11 Rules for Winning the Argument" is on sale for $0.99 https://www.amazon.com/How-Debate-Leftists-Destroy-The m-ebook/dp/B00JRJQ7Z2
I haven't read it yet, but I just bought it.
Shapiro's book "Porn Generation" is really good, and explains why the US is turning into Aldous Huxley's "Brave New World"