This was shared to me so full credit to the OP.
Not sure if it's nationwide but the T&Cs mentions "Coles Supermarkets".
Limit 5 gift cards per customer. Offer valid only in store at Coles Supermarkets (excludes Coles Online, Coles Express and purchases via giftcards.com.au or coles.scanshoppay.com.au), subject to store availability. Excludes $30, $50, $100, $200 and Variable Load Apple Gift Cards. While stocks last, no rainchecks. Offer valid from 1/2/2023 to 7/2/2023. Refer to individual gift card for terms and conditions.
@SickDmith: I found an old $30 iTunes card at the back of a cupboard recently—must’ve received it as a promo from somewhere before I was invested in the Apple ecosystem, so had never used it.
It was old enough to have a 2-year expiry so now long past it, but being a rebel I still tried to redeem it to my Apple account balance just in case. It worked—score!