Packt publishes mostly technical books. Right now they are running a promotion where if you buy two or more ebooks, each one is only AUS $5. All you have to do is add two or more ebooks to your cart, and the discount is applied automatically.
It says the offer is valid until 3rd of Jan, 2013. Obviously it would be US time-zone, but it's not clear whether it's the beginning or the end of that day.
Great deal. Thank you.