Audio Systems: Adding an aux jack, interface plugs, bose speakers

Question
I have a 2007 GMC Sierrra Classic.  It has the 6 Cd changer am/fm radio with Bose speakers.  It's great, but is their a way to add an auxillary jack to plug in my ipod.  I have talked to some audio stores and they want to sell me a new radio, surely their is another way.

Answer
yes you can do that but there is something a lot better
this interface plugs in to the radio xm port
and lets you control the ipod from the radio,full ipod text on the radio

http://www.oemautosound.com/pc-265-187-usa-spec-pa11-gm-gmc-to-ipod-interface.as...