Microsoft are currently doing a 20% off promotion on controllers. You should find this at all retailers. If you are paying more than $63.95 anywhere you are being ripped off!
However…Game are selling them out at $54! That's a further $10 off the discounted price. This is Web only price. Not available in store.
Game ship everything Australia wide registered for free as well.
The black one used to be $49… if I remember correctly. So now the white one is cheaper, but they've increased the black ones by $5.