I guess I wouldn't say common - but hackerspaces and especially fablabs will often have a Roland CNC machine capable of carving PCBs out of copper-coated-fiberg

I guess I wouldn't say common - but hackerspaces and especially fablabs will often have a Roland CNC machine capable of carving PCBs out of copper-coated-fiberglass - but once you go through all that (paying for a couple broken 1/64" routing bits as you learn to use the machine...) it starts to make sense to pay $5 per square inch at oshpark