I'm sure this will stack with https://www.ozbargain.com.au/node/134364 or if you have applied for a new CBA credit card recently.
-Spend $100 (in one or more transactions) at Caltex and receive $50 Caltex gift card
-Spend $100 (in one or more transactions) at Dymocks and receive $50 Dymocks gift card
-Spend $100 (in one or more transactions) at Flight Centre and receive $50 Flight Centre gift card
-Spend $100 (in one or more transactions) at JB HIFI and receive $50 JB HIFI gift card
T&C doesn't mention anything regarding buying gift cards from those retail outlets.
*$50 cashback will be provided when minimum $100 of eligible purchases are made at each retailer’s participating locations on the new CBA credit card by 31st May 2014 (“promotion period”).
If you were hesitant about your credit file with the $100 cashback offer this should sweeten the deal. Especially if you are an existing CBA account holder which means no annual fee on the Low Fee credit cards for the first year (and spend minimums after that).
You must apply via https://www.ozbargain.com.au/node/134364 to receive the $100 cashback however.
Hmmm, it does say "Cannot be used in conjunction with any other offer.". Not sure if it is stackable.