Wasn't sure this was real at first. But looks like it is.
https://www.amazon.com/Counting-Cost-Jill-Duggar-ebook/dp/B0C6L2JQX9/
Derick said he and Jill wanted to do a book. I guess they decided to wait until after the docuseries was released.
Gallery Books is an imprint of Simon & Schuster. The ghostwriter Craig Borlase has ghostwritten other Christian inspiration books. He also ghostwrote a book for pastor Craig Brunson who was imprisoned in Turkey. Brunson has since become a Christian nationalist firebrand who says America faces divine wrath for being a "Babylon" that tolerates LGBTQ rights.