Since we participated in the Mushroom Rally (indoor kart racing) event we were give these Super Mario shaped mushroom wireless bluetooth speakers. They work pretty well and the sound quality and volume is okay for such a small speaker. It's kind of a cool novelty item, but since it's free I'm not complaining. Also there's a suction cup on the bottom to use as a stand for your phone or tablet.

You could find something like this on google or amazon.

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