Do anybody know a good home workout DVD, for arthritis sufferers?

Due to the fact that I have degenerative arthritis in both of my knees, what I'm looking for is a good home workout DVD, that doesn't have to much impact on my knees. For example, the P90x video by Tony Horton, seems to be a pretty good workout video. But the only problem, is that I read that it's not a good workout for those who have arthritis in their knees, due to the high impact exercises. So if anybody know of a good home workout DVD, that is good for arthritis sufferers, PLEASE let me know. Thanks in advance for anybody who helps.