I simply bought some mini stereo speakers sold at Bed, Bath and Beyond. They are built into a case with a clip at the end to attach to things. You can velcro them to you cart or clip them on wherever you can. They come with a wire to plug into my iPhone. When I am done I lock them in my glovebox. I also put in a cup holder mount that I attach an am/fm/amateur radio to. A friend has a small satellite radio that feeds into two small computer speakers. The whole thing is velcro'd to his dash.
There are so many speakers out there got iPads that all you need to do is look.
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