Hi, Lisa!
(I see you're now over at VF, too!).
I have a Powerstrike Impact workout. Unfortunately, like all of the "pre-Millenium" workouts, it's out of print.
Janis Saffel has a workout called "Strike Zone" that uses a strike paddle in part of it. You could substitute a bag for that.
I know I've seen other bag workouts, but it was a while ago, and they must not have been that good because I didn't keep them!
I'm thinking maybe (not sure) Todd Geiser has a workout out that uses a bag.