The Warehouse chain in NZ is now offering a prepaid deal via a MVNO arrangement with 2 degrees Mobile
very good rates but a credit expiry of only 31 days
They also have budget phones available but are SIM locked as is common on NZ on lower priced handsets normally 9 - 12 months then free to unlock
https://warehousemobile.co.nz/
Prepaid Sims
Spark NZ, Skinny , 2 Degrees , Vodafone NZ and Australia, EE UK , Travel Sim , Plus Poland
Phones:
GSM: Nokia 5110 , 6110 , 6310i ,
UMTS - LG P970 ZTE R54 Galaxy Mini Samsung GTE3210
LTE 4G / 700Mhz Samsung J1 and J 2
LTE 4G / 1800 Vodafone 890N . Samsung Tablet
CDMA: Nokia 6385 ( now dead )
TDMA / AMPS Nokia 6120 ( all dead )
SMS contact and Tests +64 20 4577475