Can anyone recommend the cheapest way to do this? Car Toys in Seattle quoted me $650 just to add the Parrot 9100 which he said has usb/mp3 built in but I didnt see it included. Feel scammy since the Parrot is only $150 online. Starting to hate this stereo. Cant upgrade anything without paying out the rear.. TIA

 

For my 2001 S60, I found the cheapest way to add a MP3 capability was to buy a Phillips cassette adapter.

It plays mp3s from my phone / mp3 player on the volvo audio speakers. The sound is pretty good. Just plug the cassette in, then attach the cord to your mp3 device.

Got it at Sears for $20.00 or so.