Edit: Be warned this is listed as "1 pack".
Normally about $30 or so for single pack, or ~$50 for the x2 pack.
The next best deal seems to be $22 for a single pack from https://www.ozsmartthings.com.au/products/shelly-1-mini-gen3, so $20 for a x2 pack seems like a good deal if they ship them.
You might need to click through to 'other sellers' and select Amazon AU to see the $20.17 price.
Shelly 1 Mini Gen3 is a WiFi & Bluetooth smart switch relay, 1 channel 8 A Equipped with a new processor & increased flash memory - ESP Shelly and has Improved durability of terminals also used as a WiFi range extender, dry contacts, supports up to 8 A at 240 VAC and 5 A at 30 VDC. The world's smallest relay for smart control. Automate your lights, garage door, irrigation system or other small electronic devices in less than 10 minutes and control them from anywhere.
Edit: Be warned this is listed as a "Size: 1 pack", although the price for the other sellers suggest it is a 2 pack. On the flip side, the x2 pack at $34 has an image for the x1 pack: https://www.amazon.com.au/Shelly-Bluetooth-Automation-Compat… . Might just be an image error - it may require arguing with Amazon to get a 'pricing error' deal.
Edit: Looks like Amazon has removed the $20.07 Amazon AU buying option now. You could still try your luck with the x1 pack image incorrectly listed as the x2 pack.
From amazon.co.uk we can see that
B0CQCHS2QS is the one pack:
https://www.amazon.co.uk/Shelly-Bluetooth-Automation-Compati…
and B0CQCDPLCF is the two pack:
https://www.amazon.co.uk/Shelly-Bluetooth-Automation-Compati…
This link is for B0CQCDPLCF, so in theory should be the two pack. But any guess what Amazon will do/send given that it wasn't available at time of order. In any case, they've removed the $20 buying option.
Waiting for the Zigbee version to be available for sale, if they have it.