What should i get for my creative mp3 player to use in the car?

You can get the cette adapters for as cheep as like, five or ten bucks, and they work just as fine. You can get ones that plug into the headphone jack, I've had one in my car that's worked for years, and you don't have to find the right radio station or mess with any of that. So the last one, I would suggest, but just so you know, you can get them for cheaper than that.