Looking to fly to Samoa from June 18th (or a little before) to the 25th. Flights prices on Polynesian Blue/Pacific Blue/Virginia Australia (whatever you want to call it

) went from $400 to $500 NZ overnight. Wondering if I should wait a bit longer (as I'd had luck earlier this year booking a flight to Sydney only 2 weeks before) or if I should just go ahead and book it. All the other tickets on Air New Zealand, etc. are in the 700, 900 $1000 range.