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My local used electronics store has 30 Kinects for $5 each. I feel like there must be something exciting I could do with that.

If you're into the VR space you can use the Amethyst software to let it do body tracking without the hassle of slimeVR.

Still no finger tracking, but at least it can see your legs and arms move normally.

They're also great for 3D room and maybe model scanning.