Inot sure if you are looking for just the navigation system. But I had a complete OEM factory CD/CD changer with sirius satellite radio from my 2008 touareg. Someone bought just the changer. So, I still have the head unit and satellite radio receiver. I removed it as soon as I bought it and replaced it with the navagation system. It has been sitting in my garage ever since. I will sell it for $100 plus shipping, let me know if you are interested.
FYI, after everything it cost me around $2200 to put in the navigation system.