I'm going to be buying a sandisk sansa, the e250 in particular. I am buying it and was looking into buying the cassette that can plug into the mp3 player and play in the car through the tape deck. Has anyone tried it with the sansa, I wasn't sure if they would also work with the sansas. I know they work with most mp3 players, but what about the sansa? Are there any sansa users here who do this as well?