In this weeks Coles catalogue, buy a $50 Visa One Gift Card (note a $5.95 admin fee applies, total cost $55.95) and get $10 off your next Coles shop.
Essentially you get a $50 gift card (accepted whereever Visa is) plus $10 off your next shop for $55.95… giving you a $4.05 profit on each card purchased.
so what's that, 4.05/55.95 = 7.2%