I know At one point, they were really poised to become the biggest thing out there back when people still viewed the net as some graphical 3D VR playground.
I seem to recall reading somewhere that those blue SGI cases were popular to mod and install newer hardware in them. eBay lists them starting at roughly $100 bucks. Not sure if that is a good deal or what to someone needing the case or actual spare parts.
This dude actually is running all of the original Indy hardware and software, and did a few small upgrades to turn his into a MP3 playing network device.