Amazon US are having a one day sale on Western Digital and Sandisk drives. Some of the heavy spinners won’t ship to NZ, but the flash storage will. Some examples include:
Sandisk Ultra 400GB micro SD for NZ $80 shipped - https://www.amazon.com/dp/B08GYG5SVQ
SanDisk 2TB Extreme PRO Portable SSD For NZ $425 shipped - https://www.amazon.com/dp/B08GV4YYV7
WD 10TB Elements Desktop Hard Drive For NZ $306 shipped - https://www.amazon.com/dp/B07G3QMPB5
I haven’t compared to local prices yet but these seem like decent discounts.