The last 12" Star Wars figure I saw in street shops here was probably the Ultimate Boba Fett.
There is a New Zealand-based webstore that Darth Aussie might want to look into though: Arise Sir Toy - just get somone else to lock you wallet, credit cards and cheque book in a very safe place first.
I haven't really had a good look there yet, but the prices seemed to be about the same as elsewhere - maybe that was during their sales though. Of course it does cost two arms and a leg to ship stuff here to the butt of the Earth.
Even though i don't have one in my town (Myers or David Jones) i'm told they are much cheaper for 12" than TRU. Just got to be quick when they land in stock..