The current issue of Money magazine includes a voucher for a $50 deposit when you open a Junior Saver account at NAB.
I'm assuming an original voucher is required…not a photocopy. :)
EDIT: Photocopies can apparently be used!
Here's the info on the NAB Junior Saver account:
http://www.nab.com.au/wps/wcm/connect/nab/nab/home/Personal_…
NAB Smart Junior Saver is only available to children aged under 18 years old
Mod - edited title and description.
Should probably be noted you need to be under 18.