DIY diamagnetic levitation with an old hard drive magnet and carbon graphite elevator motor brushes used as diamagnetic plates.
Crudely and quickly made for nearly free.
You can also levitate a magnet with silver, bismuth, or pyrolytic graphite for best results. The graphite, silver, and bismuth act as a diamagnetic and repel a magnet regardless of the polarity.
The large (dangerously powerful) hard drive magnets are used to counteract the force of gravity so a magnet can levitate freely between the diamagnet graphite.
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Levitron: CherryWood Floating Spin Top