Cost of placing a component like the FETs here, would be roughly $0.04, plus say $0.01 for the part. The PCB would be something like $50, maybe a bit more to g

Cost of placing a component like the FETs here, would be roughly $0.04, plus say $0.01 for the part. The PCB would be something like $50, maybe a bit more to get the nice looking ENIG finish. There would be a bit of extra money required for the power supply, connectors, handling, solder stencil, etc. seeedstudio.com does online quotes, but you'll need design files.