Bullwinkle,
My wife like one by Dr. Paul Lam. It's "Tai Chi for Arthritis". I think we got if from Amazon.
Ralphhh
Bullwinkle, I have another one of Dr Lamm's videos (8 forms?) and have used it extensively over the past couple of years. Steve
I would recommend actual classes if there are any near you. A skilled teacher who can lead you through the motions, notice what you need to work on more and correct you is infinitely more valuable than just watching a video.
I heartily recommend work by Al Huang and the Living Tao Foundation. Al is a dancer and has a very lively, heartfelt approach (ie, not stodgy or traditional yet he respects the tradition).