I got my two Bantam Cochins from an auction back in 2019, and I got 6 of my Bantam Silkies from a breeder on the east (I think) of Melbourne. I ordered eggs about a year ago and hatched a Silkie and Polish.
I got my Quail from someone In Wyndham (west Melbourne).
Hatcheries are different to breeders. Hatcheries focus on just hatching chicks and sell them off when they’re young, whilst breeders will often sell eggs, chicks, and chickens. That’s the best way to describe it.
They do not have hatcheries here.
Australia does not allow you to post live animals. The closest thing you can get is eggs. I’d recommend looking on gumtree for breeders since they like to advertise there.