Murano AUX input

[Grant]

How much would it cost for just a simple MP3 aux input? My wife wants to plug her iphone directly into the stereo. The cheapest I've found is around $250, but find that pretty surprising since I can get it done to my C5 for like $40 installed.

I know about the FM transmitter, but just looking for alternatives.

Thanks

[EW]

One aux input device for 03-07 Murano says:
Radio must have a "SAT" button or have "CH", "CHANNEL", "CAT" or "CATEGORY" printed somewhere on the face of the radio to be compatible.

About $250+tax for iPod/iPhone charging and audio, and 1/8" jack input.