I saw an ad for 360g Toblerone from Aelia Duty Free for the month of April. I am unable to find the ad again but I have used the deal myself and it works.
Put the Toblerone into your cart (360g $16.90)
View your cart
There will be a discount of $16.89 so you only need to pay 1 cent
UPDATED - Discount now brings the toblerone to $4.60 and is no longer $0.01
This is only for pick up from a NZ international airport for April