You can get a discount from Sirius if you just wait them out.
My new car came with a six-month free trial of the Sirius radio system. Nea r the end of that period, they mailed me information about subscribing; it came to about $15 per month for a one-year subscription, $180. I didn't thi nk it was worth that much so I let the subscription lapse.
After a couple of weeks, I got another letter offering me half off, a full year for $89, about $7.50 per month. That seemed reasonable so I signed up.
Paul