The prices you quote are pretty expensive for 2 layer boards at least. I should ordered 3 Arduino sized boards from OSHPark (US fabricated) for 40USD. From Chin

The prices you quote are pretty expensive for 2 layer boards at least. I should ordered 3 Arduino sized boards from OSHPark (US fabricated) for 40USD. From China I would probably get 10 for about 20USD. CNC Mills kind of suck. The main issue is alignment of the top and bottom layers, the lack of vias, and that even with the additional pain (and cost) the quality isn't great (no solder mask is the main pain point). A nice, simple, PCB printer would actually be useful. But they've a long way to come and I think it's quite a niche product. They'd need to produce at least 2 layer boards with vias for me to consider using one. Ideally they'd also have solder mask. I think it's quite a niche play though. There are many differences between 3D printing and PCB printing, which make 3D printing more interesting/viable.