Apologies if I should be in maps and am new to GPS

I've just purchased the NZ map for the MY50T in the online store and thought I was purchasing a key to unlock the NZ map already on the disk in the box. Not so. There is no NZ map on the disk. Is there some way of getting this map either here or in NZ without having to wait for the mail....or business hours in Australia? (Yep, left it to the last minute).

Thanks all