Most sellers are happy to ship to Australia anyway. Most of my gems had to come from overseas.
Stuff I get locally are "bundles" or whole "boxes" with retro stuff. Like my first haul with 3 mainboards, lots of RAM, CPUs, Video cards and so on to get me started. My SS7 boards where also local ~ 12 bucks per board which IMO is decent pricing over here.
I haven't seen SS7 boards ever since, so I was lucky and they came from the same seller 🤣
Being part of Asia Pacific region, posting from China and other countries is really cheap. So little adapters, cables and gadgets I just buy new. E.g. CF cards, CF to IDE, notebook to desktop adapters, floppy cables, audio cables, optical leads and whatnot. Usually a few bucks including postage. Takes ~ 2 weeks to arrive, but otherwise it's great.
Stuff that is really rare (e.g. CMS upgrade kit for SB 2.0, I don't mind paying good money, especially if it goes to another Retro lover and not some power seller.
We also have a great IT community over here through OCAU (Overclockers Australia) and I got a few bits and peaces from there. Main problem is transportation in Perth absolutely sucks (compared to Europe) and it doesn't help that I'm trying to save the planet 🤣.