I've been looking for an FM Transmitter for a while, and this is about the cheapest I could find. Description from the site:-
This fantastic little gizmo (measure about 7cm long) lets you play your 4 million most favourite tunes on your MP3 player through your car audio system or indeed any FM radio. We tested quite a few FM transmitters before deciding on this one. So, what separates this from the rest?
Many FM transmitters only allow you to select from around 4 hard coded channels, so if they already have a broadcast on them in your area you will get very poor quality sound. However, this model has full digital tuning, meaning you can take advantage of around 200 channel options. The sound quality is superb, and it even comes with a 12v car cigarette lighter adapter so you can save on batteries when using it in the car.
If you prefer not to take the 12v power adapter with you you can just power it by using 2 AAA batteries. Whether you're in the car or out in the garden, you'll have simple and quality access to all the tunes on your Mp3 player. It's compatible with all MP3 or MP4 players.
This FM Transmitter gadget wirelessly connects portable music players to your car or home stereo quickly and easily. Just plug the FM Transmitter into the headphone jack of your MP3 or any audio source including your PDA, PC, Laptop, and then just tune the stereo to the clearest FM frequency and "Bobs your uncle" enjoy your digital music with full stereo sound. Approx 7cm long.
Take your tunes on tour!