FM Transmitters.. to play music in your car?

Where can I buy one that is at a resonable price (like.. not $50) and works really well?? The one I have.. only had it for a few months well I now have to twist/bend the stupid cord to get the music to play in both speakers of my car (like headphone jacks do sometimes.. you have to twist it so the music will play in both earpieces) and I'm about to toss it.. bought it from best buy. help? oh, btw I have a sandisk sansa mp3 player, and I have no cette in my car.. so I need one that will hook in the cigarette lighter. thanx!