What Sandisk are you considering? Different models have different options.
I have an FM transmitter that works well, but the e200 series is only powered through its USB port. There are devices that will allow you to plug it into a car or wall socket, but that's extra $$$. It is a bit of a pain to have to connect it to one's computer to charge it, but it charges fast and has a replacable battery.
I am thinking about getting a sandisk MP3 player. I would like to be able to plug it into my truck for power. Also I would like to add a FM transmitter.
Would the m240 work for this? The circuit city website says there is a DC jack but where is it? I didn't see it when I was at the store. Thanks, Carla