They are excellent, they are available, and I have them for $50 a set.
Scott Lee
http://poolknowledge.com
Scott Lee
http://poolknowledge.com
Some of the best I ever had were two VHS tapes made by Bill Marshall, aka: Willie Jopling. Lot's of how-to on the fundamentals of One Pocket.
Check the internet. They may be available on DVD.
P.S. Mr. Marshall passed several years ago, but I did have the pleasure of shaking his hand at the '05 DCC. He was a true Southern Gentleman. :smile: