Not too long ago we featured a 3 in 1 MP3 player (charger, FM transmitter, and player). Now Macally has their own version for the iPod called the FMCup, which includes 4 rubberized spring loaded mounts allowing it to slip comfortably into most standard or oversized cup holders. Plugs into the cigarette lighter for power and includes a full range FM transmitter (88.1 – 107.9Mhz). If you have experienced poor reception with an FM transmitter, fear not, as the FMCup includes an audio out jack for your favorite hookup. Also includes adaptors for older iPods including universal adaptor for 5G and Nano.
Product page here and should cost $60.