Sydney: Used Cars: Where's Best to Buy from?

Hi Sydney peeps

Where do you recommend buying a used wagon from, please?
I'm thinking privately to save on dealer commissions.

Gumtree - Running low on sellers
Ebay - Seems to be majority dealers
Any other sites you recommend?

Are there places where private sellers meet say on weekends to sell their cars or is that not a thing here?

Any thoughts would be appreciated :)