Looks like Officeworks has an iTunes offer on the go at the moment.
On their website, you can get 20% off the whole range of iTunes cards. The only restriction I can see is that there are a maximum of 10 per person.
Make sure you factor shipping into your savings.
Thanks to Adam who sent this one in.
[Source: Officeworks]
Other known gift card deals:
[25%] Big W – 2 x $20 iTunes cards for $30 – ONE DAY ONLY – 10/11/12
[20%] Myer – 20% off iTunes cards – ends 25/11
[16.6%] Target – 2 x $30 iTunes cards for $50 – ends 21/11
[16.6%] Kmart – 2 x $30 iTunes cards for $50 – ends 21/11
[10%] Coles Express – 10% off iTunes cards – ends 28/11