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Just checked and according to Wikipedia there is a Ross store in Guam - about as close to Australia as they get. Again, if you look at the link to my blog there are photos of the tubs the items came in, perhaps you can use that information to search for alternative sellers of the items that just might lead to an Australian source.
Dan, being sometimes slow on the uptake, I realized you might have been referring to the items at the front of the photo - the tree i performed surgery on to create three 'canopies' plus the trunk. Those are found in the fake plants in the housewares area of Ross stores and can be in wood, plastic, or ceramic containers stuffed with that nasty bead foam and usually with some small, shiny stones hot gun glued in place. The big one's base had a tapered threaded bit below the ground spreading trunks screwed into the foam ...