1st off, when does the noise happen? All the time?
Or only over bumps going around curves?
I only say this because my car used to make a weird groan going over bumps on right turns. It turned out to be the sway bar itself rubbing against the front subframe. Once I "centered" the bar, it stopped rubbing
I too thought it was a bushing noise....
Just something to think about, about the way to do it yourself, the rears are easy to get to, the fronts are kinda easy if you have an air wrench....