I bought a Sirius radio with a lifetime subscription on Ebay for $250. It is a little receiver module with a screen
, a knob and a few buttons on it. It plugs into a dock
that has a headphone jack, power jack and antenna jack. I bought the antenna, dock
with power supply and remote
control for $10 ea, so a total of $280. Just plug a 3.5mm stereo plug into the audio jack and plug the other end into your aux. input on your stereo and you're all set.
The seller advertises the lifetime subscription is good for as long as the radio works. He gives a 2 yr warranty on the subscription and the radio, so if either quits, you get a new one from him. I think I've had it for close to 2 yrs now, works great, gets all of the channels! $250 is less than 2 yrs of subscription alone.
I actually bought 3 docks, 3 antennas and 2 remotes. One set is for my truck, one is for my Camry and one is for my living room entertainment center. I just take the receiver itself with me in and out of the house and cars.