How to activate Iphone 4s without the original sim?

I've recently brought a iphone 4s that needs to be activated.
This wouldnt be a problem if I knew what country and network it was looked to so i could purchase the original sim.
Unfortunately I live in NZ, and the iphone is not from here.
Is there any way to activate the Iphone without the original sim?
Please no stupid answers and keep in mind it is a 4s.

Have you looked at buying a SIM card from online? You might also try to go to a place in NZ that sells iphones and buy one from there.