Where can I find cheapest airfare?

I need to go to NZ (Christchurch) for my daughters' wedding. I need to leave on March 20 2010 and return on April 3, 2010. There are 2 adults and 1 senior. Time of flight isnt important. Need to depart from either LAX or SFO. Need price including all taxes and fees. Thanks. BTW, lowest I have found is 1028 USD on V Australia.