I've been going very amateur into Pi/Arduino stuff and building some circuits. I start on a breadboard to get the design right and then solder into premade blank circuitboards.
You just solder in your wires and then draw a solder bead between the holes you want to connect. it's easy, cheap and I think fits what you're trying to do
Also there's a maker space at case western near me, there was one at GA tech where I went to grad school, most engineering colleges have one and most cities do too, just a collection of maker equipment for general use when it's not feasible to buy your own for each person. But they'll often have a circuit board printer that'll be free or cheap to use too