2degrees has a 'buddybid' promo on their Facebook page at the moment, and one of the things is $19 Carryover multi sim cards for $9 with free shipping. From the page:
This SIM comes with a Carryover Combo which is a great option for those who use a bit of everything. It has 100 Carryover Minutes and 500MB Carryover Data that lasts for up to a year, not a month. Plus you will also get Unlimited Text to NZ and Aussie. Suitable for use with devices that use either a regular, Micro or Nano SIMs.
They also have $8 talk and text sims for 50% off as well - $4, also with free shipping.
Just to clarify, both of the simcards are buy now, no bidding.