Or what is the cheapest solution for one-offs?
@ EvoMotors - Toner transfer.
I had better success using presensitized photo resist boards.
@ EvoMotors - If you have a permanent marker that is fine enough, you can plot the pcb with your new mad plotter skills. Also, there was a method that I was trying. Scratch and Etch. I couldn’t formulate the scratch off paint though.
I’ve CNCed my last few prototypes, but I don’t have regular access to a CNC. I’d always prefer to use the CNC if possible because even though OSHpark is great, it’s still close to a month turn around here in Aus, and if it’s a true prototype (IE I’ll change it several times before completion) I hate the thoughts of making 3x PCBs for nothing…
What software are you using to produce g-code for milling PCB?
I do have a PWM controllable router (like one on the picture), so I should be able to make PCB for the machine controller while the controller still on breadboard. So it’s like machine making itself. Just need to find the right software for g-code generation.
+1 to PCB GCode with Eagle.
If you don’t need through hole plating then milling works but to be honest, with the cost of professional boards being so cheap, even for 4 layer now, it’s not really worth the effort to make your own. 
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Couldn’t find anything cheaper than $100+. and for this particular project I only need one board.
What is your board size (mm) and layers?
2 layers, about 20X15 mm
If they were only $2/board would it upset you to have to get 10 of them? 
It usually takes no more than 10 days to arrive at my door after placing an order.
OSHpark.com gives you that in less than $5, because it’s less than a square inch in area; in one off, but you get three in case you screw the pooch with the soldering iron.
Are you sure you’re not confusing mm and cm? 20mm x 15mm = 2cm x 1.5cm. 20cm x 15cm on the other hand is substantially bigger (way beyond what OSHpark prices are sensible for, that comes to $240). At DFRobot, they have a price of ~$88 for a 200mm x 150mm board, delivering 10x boards…
And as an added bonus you get to look at those God awful purple boards forever… 
enclosures my friend, enclosures 
Plus if you are only making one, the chances are you’ll never see it again (until it breaks )
@ ianlee74 - I love purple! What’s wrong with purple? :dance:
Sorry, I mean 20x15 cm not mm. So the total is very close to a $100