I found Amazon to be the best for an ACDelco brand with no core charge. http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1

As someone stated that is a non-serviceable part so replacement is the only option. I just replaced both of my rear calipers about 6 months ago. As for removing the cable from the caliper itself I believe we used a big ass flat screwdriver and pliers.