$400 gift card on Telstra Mobile Plan 100GB/month $69/month over 12 months (min cost $828) — In-store and new port-in customer only - promo extended to 14 21 Sept
$1200 gift card on Telstra Mobile Plan 300GB/month $99/month over 24 months (min cost $2376) — In-store and new port-in customer only - promo ends 21 Sept
Similar gift card deals for the sim only plans at The Good Guys
I somehow missed this deal, I will look at it a bit closer
EDIT: this was meant to be a reply to another comment below, doh!