Gidday,
I have a Brazilian Microdigital TK-85 for sale. It's a ZX-81 clone, in a Spectrum-like box with rubber keys.
This was working when I tested it in Brazil about three years ago, although I'm not sure whether it is in working order now. There is no obvious damage and it hasn't suffered any hardships other than the flight out in my suitcase.
It comes with the power supply (dual voltage) and TV cable, although it would need a 2-prong continental to 3 pin NZ adapter for the power lead.
Would love to be able to swap it for a Commodore PET or CBM (see my other post here), otherwise price would be negotiated.
Update: The computer is with me in Christchurch at the moment.
Thanks for your reading,
Paul