The tongue-in-cheek/facetious _How to Ruin Your Child in 7 Easy Steps_ is marked down to $2.39 at Amazon and at Christianbook.com (the two vendors that I checked). The list price for the ebook is hard to find, but the list price of the paper-based version is $14.99 (could it be that vendors give the price of the paper-based book, which is usually more expensive than the ebook version, so that the discount appears higher? Naw, no one would do such a thing!).
Expect the book to have religious references, allusions, overtones, etc., if for no other reason than the fact that it is published by David C. Cook, which publishes to a Christian audience.
Oh, the book is high to very highly rated (or I wouldn't be posting it).
Amazon link:
https://www.amazon.com/gp/aw/d/B00RK...uin+your+child.