I have both Xm and Sirius and the other day I called too add the best of Sirius to my Xm. I plan on canceling my Sirius when it runs out Dec 15th. I just want to be sure on this, Lets say I want the life time subscription to Xm along with the best of Sirius. I have 2 Xm radios, is the life time subscription only for 1 radio or both? I believe when I called to add the best of Sirius, she offered me a lifetime deal for around $400 or something , can't remember now. But will I have to pay $400 some dollars to add the other radio, or do you get a discount?