Not sure how interesting this will be to people, since POWER8 is a very niche architecture, but anyway I ran into this:
Tyan Rack 2U Server TN71-BP012 1x IBM POWER8 10-Core CPU 2,926 GHz 2x 750Watt
299€, currently showing 7% off
Seems like a good deal for anyone wanting to get their feet...
Since we have had quite a bit of interest in Power8 recently, here is a workstation design: Raptor Engineering::Talos™ Secure Workstation
I think it would feel about like when I got a brand new SGI O2, then realized that would mean learning IRIX.