I HAVE received the book, which was really all I wanted . It looks like it will be good and helpful. But when I clicked purchase as usual, other products pop up.. there was a group of additional aids, showing physical products, and the price given was $47. Apparently , though physical products were pictured, these appear to be simply digital links or digital products. Assuming them to be digital products, which are usually very cheap, I saw the $47 as what must be a total of the book for $35 pl...