Audio Adapter?

[bigwrigg]

I am looking for an adapter that will go from micro usb (phone) to 2.5 or 3.5mm audio plug.
My previous phone was a Sprint Mogul, and I used the supplied adapter to listen to music in my truck and at my apt. I want to use my 800w just like I used my Mogul, as an MP3 player while I am mobile or at home. But I have not found any audio adapters that work. The 2 I have bought off ebay were designed for use with a headset, so instead of stereo out, they were mono out with mic in.
Does anybody out there have a working adapter they can reccomend?

Thanks in advance.