This is a result of two TP-Link product discounts that stack, perhaps accidentally, so you may need to get in quick.
The individual price will show as around $NZ27.88, and the cart subtotal for three will be around $NZ83.63, but when you checkout you should see these stacked discounts for TP-Link offers:
Items: NZD 83.63
Delivery: NZD 12.54
Total: NZD 96.18
Savings (3):
-NZD 33.46
FREE Shipping Promo -NZD 12.54
Buy 3 Get 15% Off -NZD 12.54
Buy 2 Get 10% Off -NZD 8.37
Order Total: NZD 62.72
Payment Total:
AUD 56.45
If you have a Visa card and are spending more than $NZ111 ($AU100) you can get a further $5 off, and another 5% if you have Amazon Prime.
These plugs support Matter over Wi-Fi so you can easily configure them with Home Assistant etc. There is a slightly cheaper P110 version that has power monitoring but not Matter, if that, uh, matters to you.

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Link to Tapo P110 (without Matter over Wi-Fi)
https://www.amazon.com.au/TP-Link-Tapo-Smart-Wi-Fi-Socket/dp…
AI answer - Why use Matter over Wi-Fi
You should use Matter over Wi-Fi for its robust, secure, and interoperable communication on your existing network, which ensures devices work together seamlessly across different brands and platforms without relying on the internet. Unlike older proprietary protocols, Matter provides a unified standard that simplifies setup, enhances control, and offers increased reliability and responsiveness for a vast array of smart home devices.
Reddit
https://www.reddit.com/r/homeautomation/comments/1aej0d9/wha…
Matter is a protocol built on top of the internet protocol (IP) and thus it can be implemented wherever there is an IP network present.
Matter works over WiFi, Thread and Ethernet or any other data transmission channel that IP can be implemented on.
The advantage of Matter is to have a unified standard for how smart devices on your home network communicate. Until now each company making smart devices has implemented their own API and thus they have relied on the home automation hub manufacturers to create support for their device (or open an API).