I don't think I talk too much about products and stuff but I have to say I bought this Soundfly SD MP3 player and it's been the bees knees in my car. I plug in an SD card and set it to an unused FM station and I'm rocking better then before with my old car radio. Plugs right in to the 12 volt lighter plug.
Since I bought this product I actually found others that might be cheaper. Not sure quality wise but so far this thing seems worth the money I paid for it. Still keep an eye out for better deals if you go looking for something like this.