From noon EST today. 10am Perth.
100 seats available to/from each city.
Pay by Mastercard debit card, e.g. qantascash. You can do instant transfer for 1% charge if needed, better than Tigers outrageous $12.50 "credit card fees".
LCC, so no meals, no checked bags (who needs that for bali?), BYO iPad, etc.
I don't think its limited to 2 seats per flight. I searched for 5 seats and the sale fares are still appearing although not on all days.