Seems to be matching the competition from Air Asia X, so good to see they're responding to the competition
Sale fares are for travel on selected days between 10 May - 6 July 2011 and not available Fridays, Saturdays or Sundays. On sale until midnight Thursday 2 December 2010, unless sold out prior.
*Flights from Auckland to Singapore are operated by Jetstar Airways for Jetstar Asia (3K) and commence 18 March 2011. Subject to regulatory approval.
Sale fares are one-way JetSaver Light^ fares for when you travel with carry on baggage only. However for $20-$35 more on international services you can choose a JetSaver fare and get a 20kg checked baggage allowance
Check out http://www.jetstar.com/nz/en/index.aspx for more information.