Apparently, this is all Larry's fault. He's the cyclone that wiped out the banana plantations when he hit Queensland last March. A C Nielsen has posted an article confirming the price:
Banana-gate: Aussies switch to grapes and apples as banana sales slide in the face of escalating prices
So if you're planning on a trip to Australia in the short term, expect to pay a lot for bananas in the peel. And in smoothies. The Sydney Morning Herald reported this week that at one smoothie bar, the price for two smoothies is $14 Australian.