Good luck. I bought an Innovation brand and another 3rd party one that was purple, I liked the Innovation one better. Cables are a little thicker. I think somebody's still selling them on ebay.
Don't buy any s-video cable with a yellow RCA video connector also on it, it'll just be composite through both. Also, don't buy a 3 in 1 or any universal adapter. As long as it's just the s-video connector and the red and white audio jacks, it should be fine.