EDIT: OZBARGAINED! @ ~5PM AEST
In case anyone is planing on buying big:
Enjoy $50 credit back when you stock up at your favourite online stores this spring! Just spend $250 or more at Woolworths, Big W, Dan Murphy's and Masters Online stores between 19th September and 22nd October and you'll receive a $50 statement credit from American Express.
EDIT: Participation is limited to the first 2,200 cards to be registered. The Offer is limited to one statement credit for each Registered Card.
Redemption instructions from website:
1. Register your eligible American Express® Card
2. Shop at Woolworths Online, Masters Online, Big W online or Dan Murphy's online.
3. Once you've spent $250 at any combination of participating online merchants you'll receive a $50 statement credit back to your American Express® Card.
So it appears you do not have to spend it in one transaction, or at one marchant.
Yes