Some time ago, I managed to get a (broken) X68000. The power supply died the first time I powered it on, but it wasn't much of an issue, as you can easily replace a broken power supply with a standard ATX one, as explained here.

The main issue with this X68000 was an overclocking mod that had been performed by its previous owner, and prevented the machine to boot. I managed to remove this mod (the tricky part was to eventually find a track on the motherboard, which had been cut), and everything went fine. However, having an ugly grey box (the only spare ATX power supply I had at that time) was really awful, especially as I love the case design of this machine.
So I purchased another ATX power supply, and managed to fit it into the case, reusing the original fan for proper cooling of the whole thing.
Here is a picture of the X68000 and its brand new power supply ;)