[BigO]

Crutchfield has lots of options. You could purchase a plug-n-play unit with a built in FM transmitter which will play XM over the FM channel you choose.

Here's a link with more options...

http://www.crutchfield.com/App/Product/Category/GroupMenu.aspx?g=251350&tp=1413#

 

[BigO]

XM plug-n-play units...

http://www.crutchfield.com/App/Product/Group/ProductMenu.aspx?g=250150&tp=592&nvpair=FFService|XM#