The 22 game machines (including monitors, cables, and peripherals) cost about $75,000 in total. The house overall was a 7-digit number. Sorry, I'm not comfortable being any more specific than that.
> If it's hardware or something that's not so easy to try out over the internet, find a different way to show how it actually works—a video, for example, or a detailed post with photos.
Hopefully I did that?
Additionally, I've put code and a detailed guide for the netboot computer management setup on GitHub:
https://github.com/kentonv/lanparty
Anyway, if this shouldn't have been Show HN, I apologize!