Here's one for you…
Apple has launched a takeback program where you can drop off your dodgy cheap knockoff USB power adapter and they'll sell you an official one for $10 USD equivalent.
Not sure if this means you can get an official AU power adapter for AU$10 + cost of dodgy cheap knockoff power adapter… but no harm in trying, right? (unless you get electrocuted in trying - that might cause harm)
FYI