I saw an ad for all three books for 100 bucks
Professional Baking Fourth Edition and Study Guide By Wayne Gisslen
* Hardcover, 701 pages
The Professional Chef - Fundamentals of Baking and Pastry Fourth Edition By Bo Friberg
* Hardcover, 1020 pages
The Advanced Professional Pastry Chef By Bo Friberg
* Hardcover, 850 pages
Are these books are good and is it a good deal?