There's always a few for sale on the local Gumtree or Facebook market place. I bought a GN XXX Hand Crafted last week for A$40, it's a ripper. There's a Prestige for sale at the moment for A$300, so unless you want a low density monster there's no need to spend A$1100 unless you are getting a custom order.
You only pay import duty on the declared value+freight so it all depends on the value on the paperwork.
I've had and used quite a few Australian made GN's (note just because they are made in Melbourne they are not all Kranzie's) and like any other bat maker they are not all amazing. I've got a couple of pretty average Keeley's and two very disappointing Laver's so don't imagine that GN's are any different. Having said that, the good ones are pretty special.
I'm always on the lookout for anything decent from GN here in Australia and would consider some sort of trade (cash either way) for a nice Salix Pod or Kippax. I'm not interested in anything else, I've got/had most of the others.