@Alex_Egg sorry for the confusion, the book used to be available for individual purchase for $29, this had nothing to do with subscriptions. We recently removed that, and unfortunately, and missed updating that copy.
The mistake is ours, i see why you thought what you did. Even though your plan level doesn’t include books, I’ve added the book to your account since you had expected to get it.
Thanks for your patience and sorry again for the trouble,