WTB: Factory CD Changer for Monsoon

I have a 2002 Camaro SS w/Monsoon system. I'd like to add the rear CD Changer. Can anyone recommend where to buy a factory unit at the best price?

If anyone has a used one for sale, I'm interested also.

Thanks!

I have a monsoon with the 12 Disk CD changer from a 97 T/A and I am looking around at a new stereo , If I find a new one the changer is f/s