You have to remember that *everything* in Aus will be much more expensive than in the US. With a population less than 1/10th of theirs, we're bound to have 1/10th the demand for a conveyor dryer (if not less).
That being said, the place I buy my screen printing supplies from online,
www.gjsmachinery.com.au has a mini classified section (a place they sell second hand equipment) and I've seen conveyor dryers in there for 2-3k before.
Hope this helps!