what you need is something we cant get in NZ
Critter cages overseas are perfect, and cheap. You can get them from amazon shipped, but shipping costs a bit.
a standard 10 gallon is all you need to get started for one.
A 'reptile' enclosure here will set you back $$$
Get reptile carpet substrate, mount a heat mat under the enclosure, no lighting other than enough ambient lighting during the day to see them.
Buy a thermometer / hygrometer, some bowls, 3 hides and your pretty much done.