You can currently get steam gift cards from Big W at 10% off. This is a great way to stack an extra discount on game downloads. Purchase already discounted games using credit you purchase from Big W. You purchase these cards in AUD and when you add them to your steam account they will be converted to USD.
These gift cards are available discounted as part of the Toy Sale at Big W. You can purchase them in $20, $50 and $100 amounts. Get these in store until Wednesday 12th July.