Are the iPhones at the duty free store in Auckland airport UNLOCKED?

I'm going abroad at Christmas and I want to buy an iPhone 5s at the duty free store as they are a LOT cheaper. Does anyone know is these iPhones are unlocked, so I can use them on any network and so I don't have to pay 100 dollars to get it unlocked? I would really appreciate some answers.

All iPhones are sold unlocked. Anyone who claims they're not is wrong.