I just built one of these and this thing is really cool. I ended up with black case and white front/back panels. Everything needed came to run it I didn't need the serial cable/adapter so it cost me $66 + $8 shipping and came in 8 days from the UK to the US.
SC131 – Z180 Pocket Computer
SC131 is a pocket-sized Z180 RomWBW CP/M computer. SC131 – Description SC131 – Assembly Guide SC131 – Circuit Explained SC131 – Firmware, RomWBW SC131 – Firmware, SCM …
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SC131 Pocket-sized Z180 RomWBW CP/M computer kit by Stephen C Cousins on Tindie
Pocket-sized retro computer in a small case running RomWBW CP/M
www.tindie.com