In 2009 I bought a lot of 10 late 90s Sun servers (1997 machines upgraded a few years later with better CPUs) for $300. Original list price about $2.5 million. After fixing a few problems and swapping parts to max out half the machines, I kept a few as my compute servers, and traded the rest for SGIs. An Onyx for the museum, and a small (one 6' rack) Origin-2000 for myself.