XM Canada has a great deal on right now.

Anyone wanting a cheap subscription can sign onto the Canadian service for one year for $64.89 ($100 off). As with the many Canadians who signed up for the U.S. service, all you need is to provide a Canadian address.

The offer is valid on GM cars or PnP radios.

Use code: OEMEPP100

at this site: XM Satellite Radio Canada - Activating Your XM Radio Online

There are reports that this $100 off special also works for additional radios.

This is the Canadian line-up: http://www.xmradio.ca/pdf/ChannelGuide_EN.pdf

vs.

the U.S. lineup: http://www.xmradio.com/pdf/channel_guide.pdf