Somehow missed this post, or would have replied sooner.
Modaks in Melbourne or BJs in Brisbane are likely places.
Both have extensive stocks of everything, and a longtime history with RE.
Modaks are mail order only these days, I understand.
Hitchcocks in the UK are pretty good too.
And postage is not too bad on small light items, sent economy airmail.
Can be quicker than internal aussie post !!