I need a good Transmitter to play the iPod through the car stereo?

[MomtoP]

This exists right? My DH loves his iTouch (a gift to me, which he then took over, HAHA) SO I'd love to get him something, so he can plug it into his car, and play his tunes instead of driving with the earplugs in? Can anyone recommend a good one for a good price? Need to spend less than $100....THANKS!

PS Sorry that I don't really know what I am talking about, but hoping someone can help!