Auxiliary input for a 2008 Mazda6?
 

This is the stereo I currently have:
http://c.photoshelter.com/img-get/I0...ssedan-142.jpg
What I want to know is if I can manage to hook up an Auxiliary port to this without selling any body organs. Meaning, I don't have a lot of money.

Is there a really cheap mod that I can work with, or, at the very least, is there a cheap part that I can buy to hook up to it that will allow for an auxiliary input? I found one from XCarLink, but if I can find something cheaper I'm all for it.

My FM transmitter is acting freaky these days and it's annoying me to wit's end.