I also think some of them may be 'grey imports' from Japan. On the Japanese market there is a big rivalry and price discounting between the Jazz and the Yaris to attract young first time buyers, in the hope they will remain brand loyal for life.
Japanese Government policies encourage new car manufacture for the Japanese market and exporting the surplus used, but nearly new, ones to neighbouring countries who also drive on the left. In some of these countries the buyers tend to favour the largest and flashiest models they can afford. So an unusually large proportion of the smaller more economical models may appear on the NZ market.
IIRC a version of the MK4 is available on the Asian market with a conventional ICE engine. As long as you are getting the hybrid version I dont think you will regret it. If supply does exceed demand at present I dont think it will be long before buyers come to appreciate its qualities and they will be increasingly sought after.
