I got mine sent from Singapore. They're everywhere on eBay, and wouldn't be surprised if they start popping up randomly in some car shops.

Remember the replica ones don't have the 'pin' to hold it in and thus uses 3M tape only- which does need to be replaced every now and then. There is also going to be a gap between the visor and the window which isn't perfect as a result compared to genuine.

I'm quite happy with my replica ones for approx $60 (can't remember), but if I had to choose again, I would go genuine since I know genuine ones are only approx $250+aud if you buy yourself in Asia.