How do I upgrade to my headlights to HID?

I am wanting to upgrade my 2006 VW Jetta’s halogen headlights to HID, the same type that are in the VW’s that come with HID, not the really blue or really purple. I want to do this without having to spend a whole lot of money. I also do not want to do this myself. Does altering my lighting void my manufacturer’s warranty? I live in Nashville, TN so if you know of anywhere that does this in the area, please let me know.

Thanks.