Get a free 7 day trial for SiriusXM Online.
Use a free 10 min email http://10minutemail.com/ as the email address for your login.
I just tested this and it works with the SiriusXM APP for the Ipod/iIphone
Every 7 days just sign up for a new free trial with a new free email and doing this you will make it so you never have to pay for SiriusXM Online.