Available here (in limited supply):
From Etsy: BUY NOW: Perpetual Marble Machine (reccomended seller)
Note: poorly designed knock-offs are being sold widely that are not at all the same device. If the price is less that $150 USD then it is not the same quality device and mechanism as shown here.
Perpetual Motion Simulator: this marble machine device does not break any laws of thermodynamics- but it sure looks like it! When I first saw videos of this piece of kinetic art I thought the effect was due to video editing, but in fact the base contains a power source and very clever mechanism (swipe twice for clue/partial reveal). An amazing piece of art by William Le expertly crafted from stainless steel wire, doussie hardwood, and undisclosed internal components.