I have some extra PCBs for the original uCurrent Gold, made from Dave's gerber files. I had intention to make a customized uCurrent with BNC connector, but editing Altium files without Altium Designer is a pain, so I ordered a few PCBs of a "vanilla" version, because I've had already my components sourced. They are simple green PCBs with leaded HASL finish, not as nice as original red w/ENIG, but good for manual soldering. Contact me via PM if interested, costs of each are about €1.5 (have to check it), shipping costs from the Czech Republic should be about the same. I can also ask my colleague if you want some hard to get "DigiKey only" parts for uCurrent, as he orders from DK quite often, but I can't guarantee any delivery date here.