[Symbiote]

I DIYed an ErgoDash for about €150, mostly from keycapsss.com. That meant buying a PCB, case, parts kit, Arduinos etc from them, and key switches and cheap keycaps from China.

You can further reduce the cost by ordering the PCB yourself from China, and some components from electronics suppliers, or laser cutting a case yourself at a maker space (or doing without).

It's also possible to do without a PCB, and handwire the whole thing. This is common where there's little alternative, like on the Dactyl or Dactyl Manuform 3D keyboards.