I've sent feedback on that issue more than once. If I've selected an address, why even show me stuff I can't get at all? Just wastes my time.

Yeah I logged a support ticket with them over a year ago complaining about this behaviour. They just don't have it up the list on their priorities I suppose. 

I see that pretty often to be honest.

SirHumphreyAppleby:

 

It's Mt Maunganui they have a problem with.

 

This isn't an error. Here's the key piece of information...

 

 

The item is available for shipping to New Zealand, but only used.

 

This will be what it is.

It's also very frustrating that there is no easy way to filter out used sellers who ship internationally. Some say international shipping but depending on whether the product ships direct or from an Amazon DC you might find they then can't ship it.