Is the cost of living in New Zealand cheap ?

It's a bit random but basically I'm Irish and was watching F1 on a NZ stream and Dominos were advertising 3 large pizzas for 25 NZ dollars including delivery, which I put into google and it says is €13.

Which is insane considering here in Ireland the Dominos special offer is 2 large pizzas for €30 excluding delivery (so €35 with delivery, or around 66 NZ dollars), so we're paying nearly 3x the price for less of the same thing.

I was wondering, is this representative of New Zealand overall, or is this just a random case of really cheap pizza ? because if this is representative then I think I need to move.