we went with helipark a month ago today! I think its the cheapest you'll find
http://www.helipark.co.nz.
We got a nights accommo, fancy dinner & breakfast and a packed lunch and 4 runs...all for just under $600AUD
$325NZ is your access pass & each run is $75NZ after that.
check my video I posted in the short film comp for a bit of footage. It was so much fun. Only catch is its not close to queenstown...took us about 5 1/2hrs to drive up from Qtown but if you're into it, a good idea would be to get up early...drive to wanaka & ride either cardrona, treble cone or snow park for the morning & then drive the rest of the way after lunch. (I recommend snow park cos its the cheapest & so much frigging fun - even if you've never ridden much park before. They've had a ridiculously good season as far as weather goes, too & are unlikely to be closed) That way you don't lose a day of riding.
just an option. feel free to ask any questions!