Joining in a bit late here...
It's very interesting to learn how things work in other places. There are big differences between my experience here in Adelaide and everyone else, even some differences between the market here in Adelaide and up in Brisbane near where
@Ribh lives.
I don't know of any hatcheries in Adelaide that offer sales to the public. The egg and meat producers have breeding programs and hatcheries, but if at all, they sell pullets to the fodder stores who then sell the pullets to the public. Chicks in bins and chicks through the mail is unheard of, but fertile eggs through the mail seems to be a thing some breeders offer.
But I don't know anyone who's bought their pullets from fodder stores (apart from myself - my first three pullets were from the fodder store). Everyone I know with chooks can tell the story of where the bird was hatched and who hatched them. Mary and Janet were from breeders focussing on one or two breeds. My neighbours bred and hatched their own four hens (now 8yo and still laying when the moon is blue) and their new, younger hens (3yo and laying like clockwork) were hatched by their brother's neighbour. Sandy is an exception to the rule, having been found walking the streets.
The local council's "good neighbour" bylaws rule out noise, so most roosters are precluded from suburban flocks. So there's no point in fodder stores offering cockerels for sale.
But the chookless neighbours love my hens and bring their kids in to see them

It's been a great way to bond!