Deal is on again beginning week of 20 Oct and looks like only $100 and $250 eligible. $5 and $7 fee applies per respective amount and limit of 5 per customer
Coles Mastercard Gift cards cannot be used to purchase any other gift card sold at Coles.
Warning! Coles Prepaid MasterCard Compromised (Multiple) CHECK Your Cards NOW!
How to check if your card has been swapped out - The card ID MUST match the last 11 digits of the barcode.
Mod: Third-Party Gift Card Deals at Retailers - FAQ - Thanks to WookieMonster.
Discount not worth the risk.