I am trying to increase my exercise dvd collection and was wondering if there are any older dvd's that would be worth getting? Looking for ones that are a lot of cardio and no floor exercises due to knee issues.

I bet you could get some of the old Jane Fonda tapes or Tae Bo at the library or on Ebay for cheap. I used them in the old days and they were pretty good! Some of the music and hair styles will make you laugh (on the Jane Fonda, esp) but the step classes are great.