Upgrade your stock sway bar with this OEM S4 sway bar which is thicker and will provide improved cornering and stability.
This has been on my car for 6k miles - it's virtually new. As you can see from the pics all bushings are in perfect condition.
New - this is selling for $230 - http://www.ecstuning.com/ES1894016/
From the dealership I'm sure just as much...
PM me if interested.