Several of my friends purchased a Sirius lifetime membership for $499. As a loyal XM radio customer, I don't remember getting any news of that promotion. Here is XM's pricing to get the new Sirius Channels which includes Sirius NFL radio, Howard Stern, Martha Stewart Living and Playboy.
$458.00 - 3 years XM and Sirius
$322.00 - 2 years XM and Sirius
$186.89 - 1 year XM and Sirius
$16.99 per month - XM and Sirius
$50.97 per quarter - XM and Sirius
$12.95 per month - XM only.
I didn't like the idea of a lifetime membership when I first heard about it. That said, it sure sounds like a great offer now.