I tried a search, but couldn't seem to find what I was looking for. When I bought the 2006 X5 a few weeks ago, salesman told me that I could buy something at Radio Shack for $100 in order to play MP3 player via my cd player/radio/bluetooth. I do not know what he is talking about. I'm familiar with the FM tuner types made by Belkin etc. Is there a way to hook up a Creative to play in the X? Thanks for your help!

BTW, I have single CD player and no nav if it makes a difference, which, according to search, it does.