These discounted NZ hops are probably from previous seasons, but as long as they've been stored properly they should be fine. Just beware that the AA listed on the packaging may not reflect their current bitterness contribution.
I've used Rakau and Nelson Sauvin and enjoyed both quite a lot. Use them for aroma/flavor additions and combine them with a 'C' hop for a interesting PA/IPA. On their own they can be cloying. Make for a particularly awesome aroma when used to dry hop.