If you are unable to get to a 7-11, Myer has the same 20% off iTunes card deal on at the moment.
The offer is available until the 13th of May.
[Source: Lasoo]
Other known gift card deals:
[20%] 7-Eleven – Discounted iTunes gift cards at 7-Eleven – ends 7/5
[20%] Woolworths – 20% off various gift cards – ends 8/5
[12.5%] Good Guys – 25% off your 2nd iTunes card – ends 14/5