This Media Player

JandR.com has the Griffin Technology 9781-TRP30-BK-2 iTrip LCD FM Transmitter for iPod for $15 + $7 shipping = $22 shipped. SmartSound technology auto-adjusts signal strength for each frequency, Backlit display for easy viewing in any light.

Product description from JandR.com:

One-Touch Tuning / Built-in Antenna / 10 to 30 feet (3m - 9.1m) Range / No batteries required, iPod powered / 88.1 MHz - 107.9 MHz RF outpu!
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iTrip broadcasts the Music from your iPod to an open FM frequency on your car?s FM Stereo so you can play your tunes through your car stereo?s speakers. New brighter high-contrast display is easier to read in any light while SmartSound technology maximizes the FM radio signal sent by iTrip to your car?s FM radio.

Included USB-to-mini-USB cable connects with Optional PowerJolt car Charger to charge your iPod while it plays

SmartSound technology auto-adjusts signal strength for each frequency

Backlit display for easy viewing in any light

0.2 MHz per step Radio Frequency Increments

Dimensions: Width 2.45″ x Length 1.43″ x Depth 0.9″ (62.5×36.5×22mm)

Weight: 0.6 ounces (17 grams)

Product link.