Amazon US through Amazon AU.
Looks like a good deal. Each one would be $21.37.
Downside is that it has US plug. You may use pliers to make it Aussie (not recommended!).
Judging from my C100, and C210 cameras, it supports ONVIF
and could work locally
if you enable it (means no need to be connected to the internet). Personally, I use it with Blue Iris NVR (not using the official app since it's not connected to the internet).
I think it's alright for an indoor usage where you don't have poe around.
Be aware that it's still using old Wifi 2.4GHz.
Also 1-pack of C100 (not C110, 1080p) is $27.09 which isn't a bad price, especially considering that the lowest price for the AU plug version was $32 according to CCC.
Just remember if you're doing 2.4ghz, and have other parts in the house relying on that old one, four cameras on it is going to use a good chunk of that available bandwidth.