About $300-$500 aus dollar.
I do have all the speakers, but just wanted to add the sub. I guess I can try add in the centre piece where the control is and try. Was hoping the stand alone sub would work.
Well, being in Australia makes a huge difference. Most of the decent subs, are American made and designed and not widely available outside North America.
I would not pursue that BA sb any more. It will be a much good as a sick headache anyway.
I have had a look at what is available, and your prices are outrageous, even for absolute junk. I can't find anything any good, anywhere near your price range.