These guys in MA, USA are offering 100 square inches for $95 plus shipping worldwide.
https://www.internationalcircuits.com/layer_grid.php?cat_id=13
Lots of things included - silk screen, solder mask.
Don't know how much effort is needed to create gerber files, drill files, etc.
I don't know if these guys ship international, but I used expresspcb.com's miniboard service to get 14 3.8" x 2.5" boards, fast turnaround, $165.
Same with shipping to AU would be $210, difference is the shipping.
They have a special serivce, 3 of the same size boards, $51 plus shipping ($55 to AU).
The ExpressPCB schematic capture & layout software is quick to learn & easy to use. Here's the design I had built with 2 built up CCAs in a box (cut in half down the middle)