If you can "pack & go" then check online at www.airnz.co.nz and then check out www.experiencerarotonga.co.nz
Experience Rarotonga has some great prices for last minute accommodation in Feb/March...
If you don't have the luxury of travelling now, then don't despair these great prices are right through until end of June and start again in August 2014 (unfortunately school hols and July not included)