Both the 2.5" and the M2 are the same price at 174 NZD, and shipping for me to CHCH is NZ$17.68 for either.
2.5" SSD: https://www.newegg.com/global/nz-en/Product/Product.aspx?Ite… (cheapest on pricespy was 276)
M.2 2280: https://www.newegg.com/global/nz-en/Product/Product.aspx?Ite… (cheapest on pricespy was 327.75)
NOTE: the m.2 stick is SATA speeds! It is not an NVMe
Similar deal on Amazon NZ$189.36 delivered.
https://www.amazon.com/Crucial-MX500-NAND-SATA-Internal/dp/B…