Lower control arm bushings worn?

[Ken92SVX]

I have a clunking noise when going over bumps and around corners that I think are caused by the lower control arm bushings which appear to be worn. Using a pry bar I can see that the bushings are cracked around their circumference. I have replaced the ball joints which were worn; this helped with the problem somewhat.
Is this a typical problem with the control arm bushings? Does anyone have any used control arms for sale that are in good shape? Is there a group buy available yet on the control arm bushings?
Thanks, in advance. Ken