I tend to use dirtypcbs, which I don't think is the cheapest around anymore - maybe try
https://www.seeedstudio.com/fusion_pcb.html too.
A batch of 12 (2-layer, 1oz, 6,6mil, roughly 5x10cm) boards I got made a couple weeks ago, which were a rush order DHL shipped to New Zealand, totalled roughly $60USD. Without rush processing and quick shipping, I think the same thing would've been a little over $20.