https://www.facebook.com/groups/311535095608900/
*Disclaimer - it is mostly based out of USA/Canada, so mainly a place to look at pots for those down under, but there are lots of nice ones - new independent potters, and some antique Japanese/Chinese stuff too. I'm pretty sure I saw a bid from Pup on there.

If there is enough interest, I'm sure an ambitious person could start an Aussie version too. Or maybe there is one and I haven't found it yet.
While I'm at it, there is a bonsai swap page too, so you can trade plants/supplies instead of buying/selling. I've enjoyed both pages, and I'm thinking about what I might be able to swap at the moment.
https://www.facebook.com/groups/217399495126963/