Whakapapa is offering free season passes for those under 10 year's old, or 75+ during the pre-season period. (ends 8th June)
For infants (0-4 years), they remain free in season.
For Child (5-10 years) & Super (75+), In season, the season pass price goes up to $499 ($399 for weekday only), and day passes are fairly substantial.
Also pre-season discounts for other age groups.
We had a card already, but last year, I think it was possible to opt out of the $5 card, and pay it on the day (in case you don't actually make it to Whakapapa).
Last years listing:
https://www.cheapies.nz/node/46214
Note that Whakapapa & Turoa are now separate businesses, so this offer is for Whakapapa only.
Also Whakapapa has had the Sky Waka Gondola operational for a few years now, which I have yet to try out myself. Much easier for sightseers to get on and off than chairlifts.
I think it's not possible to opt out the $5, or if there is can someone show me. I tried removing each time and when you click continue it adds it back