I could send down one each of these red pcb+panel @cost. They are absolut bottom of the technical scale (almost)
the one with one button is a very basic CEM3340 VCO based on sams sketch on the website. it’s not a difficult build at all just a few mins work… there is an error on the PCB but easily resolved. it outputs tri and saw and has CV in.
the second is a 3ch mixer, this is even more basic to build.
those together get you basic waveforms with some amplitude control. fairly easy to trouble shoot.
Apart from the CEM and the Alpha Pots. Everything else is cheap…