Spotted these posters in Sanity today. Buy one iTunes card, get one of the same value for half price.
2 x $20 cards = $30.00
2 x $30 cards = $45.00
2 x $50 cards = $75.00
Anyway, it effectively 25% off which is the best iTunes discount around at the moment (I think).
If memory serves correctly this offer runs until the 25th March.
Bring back the 50% off at BIG W!