Linked to The Warehouse url as it's nationwide but they only have the butter (smooth and crunchy). PAK'n SAVE (50c cheaper) has both the butter and hazelnot but not in all stores. Petone has it for $2.49, Manukau 2 for $5.
https://www.paknsave.co.nz/shop/Search?q=peanot#
It's $6.50-6.79 at Countdown/New World so a decent saving/clearance.
Have no idea what it tastes like but if your kids can't have peanuts/hazelnuts it might be a good alternative.
Reviews seem pretty good - peanot butter and hazelnot spread.
Award for product innovation in 2021.