I'm currently having similar issues with my '07. The source is my upper control arm. Using a long pry bar, I'm able to see way too much movement in the ball joint. I have some Rocky Road replacements on the way now.
After shipping, the pair is around $370. Hopefully, your issue is something simple like sway links. Disconnect them and slowly drive around your neighborhood. If the sound is gone, it's the sway links. If I have to switch one, I switch both. Even if the other side is good, it's probably not far behind the other in failing.
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One foot in the grave.