I appreciate the reviews, you guys! I never want to try to promote my own stuff...so, it is always greatly appreciated when others see value in my books.
Prices here at TW are $23 for Tennis Mastery, $28 for Coaching Mastery. (TM is 335 pages, CM is 402 pages.)
The difference in the books is that Coaching Mastery focuses on the training of players both individually and in a team or club setting; attracting players to a program or school, how to effectively train large numbers of players, how parents can work with their own children, (common pitfalls by parents in trying to help their kids, etc.), and over 75 very productive drills. It also includes all the tennis teaching strategies, philosophies, methodologies, technical components and progressions that are in Tennis Mastery.
Hope this is some helpful information. There are other good books out there too, including John Yandell's Visual Tennis; High Tech Tennis by Jack Gropple; and of course, Winning Ugly and Inner Game which are more mental applications for tennis players than technical.
Good luck!