looked locally? i'd imagine there be a bunch available here on the forums for a start. IMO, have a crack locally first, if no luck, go Japan.
unless you're after something really specific, or want to be the first Oz owner.
As for import yards? there are just too many dodgy ones. You're better off using a broker, like Iron Chef, to bring one in. In terms of hidden costs, you won't really get any with a good broker. You pay your fee, they do the search, once you find the one you want you just start paying the bills as they're due. They just tell you when, where, who and how much All of which i'm sure would be explained before starting out.