Qantas points top up promo running this week:
"Get 25% more points when you purchase 15,000 - 55,000 Top Up points, or 50% more points when you purchase 60,000 - 150,000 Top Up points."
Purchasing points is usually a pretty poor value way of increasing your points balance, however if you are short of points for a classic rewards flight, this might be a good way about it.
Better off buying Qantas wine etc