Thanks to JoFord63.
Buy 3x$100 Myer giftcards with 2 Amex cards(three transactions. $100 two times and 2x$50 transaction with two cards).
You will end up $330 gift cards with 2X$35 back from Amex. & There is $50 cash back from Philips as well.
You will end up spending $180 and $36 gift card balance left.
Edit: Seem like my method is not acceptable.
was $369.00 now $294.00