Just went to Coles, and they have 20% off iTunes Gift Cards. They aren't as good as 2x$20 for $30, but they are decent. (~$31, after price match at Officeworks)
($20 for $16 or $15.20 after price match at Officeworks)
I'm unsure of expiry, but it might be tomorrow. This was at Springwood Coles. Unsure about the others.
Yeh the expiry is tommorow.