For anyone travelling to Australia for the Xmas holidays and need mobile broadband, this might be an economical solution for you. Australia post (post office) are selling a Pocket wifi modem (Vodafone) which includes 3gb data (lasts 30 days) for 19AUD (link). This deal goes until 24 December.
This pocket wifi modem can connect up to 10 devices concurrently.

Good luck and enjoy your trip.

Gary

This post has been edited by gzg: Dec 9 2014, 11:44 PM