I purchased an FM modulator thingy for like 10 bucks at Walmart. Works like a charm.

 

^^ that is your best bet unless you want an aftermarket deck.

 

yup. fm transmitter or a new head unit.

 

those FM things suck.

get a new head unit. A simple one will only cost 50-100 bucks.

 

FM modulation is not that bad. I have it in my Porsche (MOST is fiber optic so there is no way to add anything without replacing the BOSE head unit). I have Sirius and listen to MP3s with a Kenwood receiver hooked up with FM modulation and the sound quality is pretty good.

 

I use one like this and am very happy with it. If you are in a big city you might have trouble finding a good station without much interference, but in most areas a station like 88.3 or 88.5 or 88.7 will work just fine. Just experiment with the low stations until you find one you are happy with.

Griffin iTrip Auto Universal FM Transmitter w/ charger - eBay (item 400122555433 end time May-19-10 12:53:00 PDT)

 

Instead of a wireless FM transmitter use a wired FM modulator.