I ended up spending about 6 years (in short bursts) doing this for one project - all the iterations were error-fixing on my part. I started out with OSHPark (I

I ended up spending about 6 years (in short bursts) doing this for one project - all the iterations were error-fixing on my part. I started out with OSHPark (I know the owner personally) but I wasn't able to manage $30 a run when I wasn't very good at PCB design to begin with. JLCPCB made iterating on real PCBs possible. I have found JLCPCB's quality to be fantastic. The only exception being I think once the silkscreen looked a little crummy because it was matrix printed (they offer a nicer process, but I was not concerned with it.