Dear Cartrouble:
Curulz is correct. We did a show dedicated to the topic of self-defense for those with physical limitations during season 3. In it, we described the logical process of determining what abilities you do have, how to make the best use of them, and, most importantly, how to use awareness and avoidance to keep from having to use physical skills. With the latter point in mind, in every scenario we do, we typically conclude with an avoidance-based solution. If you have limited physical abilities, that is the version of the scenario you should study most and use for the basis of your personal tactics.
As for DVDs, the last I heard, season 3 will not be made available; however, there are plans for some type of on-line presence for previous seasons. I'm sure once it's all ready, it will be announced here.
I hope this helps.
Stay safe,
Mike