I have a levitating bluetooth speaker. The speaker is shaped like a ball (sortof looks like the Star Wars Deathstar) and levitates (floats) above a base. It has been used a couple of times so it is still in like new condition and packed in its original box. The speaker has a built-in rechargeable battery that is supposed to last up to 10 hours on a charge, I have only let it play for a couple of hours each time I have used it.
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The speaker sounds pretty good and looks cool because of how it floats and is usually spinning slowly, if you are careful you can also give it a spin while it is floating. Getting it to levitate is a little tricky but not too bad once you get the hang of it. You have to slowly put it in place above the base and there are LED lights on the base that help guide you to the right spot to make it float.
If you want to see it in action you can find some videos/reviews of it on YouTube.
Please see the pics and reply to this post of interested, I am asking $40.