Marketplace
This has been on their facebook page for a few days (https://www.facebook.com/LogitechAustralia) but it doesn't show an end date.
Products / Gift Card Value
Logitech UE 6000 (White or Black) $50 Card, Price = $299
Logitech UE 4000 (Black, Purple or White) Noise Isolating $30 Card, Price = $149
LOGITECH UE 400 Noise Isolating Headset $20 Card, Price = $99.95
EDIT: Just saw their prices are actually pretty poor
eg UE6000 can be got for $186! - http://www.eglobaldigitalcameras.com.au/logitech-ultimate-ea…).
But maybe your Grandma gave you a Dick Smith card for your birthday last year & you really have to use it.
Get them elsewhere and you have enough money to buy a $30 card and still have change left over.