The rear control arm("wishbone" in the parts catalog) comes with ball joint. The front control arm("tension link" IIRC) is separate from the ball joint. The "wishbones" were about $70 each from the stealership. I imagine the "tension links" are more expensive. BTW, my stlr estimated $750 to replace the rear control arms including the alignment...

I just replaced the rear control arms Friday night. 'bout 2 hours to do both sides. Check the "Front End Shudder" thread.