I was looking for items from Amazon UK to pad my order to get free shipping with the Persona 5 Royal deal posted earlier today, and found this by chance. Lowest price since 21 June 2021, where it was AU$26.19 from Amazon US.
Personally, I'll be using one for the car as a budget theft countermeasure (yes, I'm aware they're not as effective as active GPS trackers where you have to pay a yearly subscription), and another for my laptop bag. Do be warned, however, that if the car thief also has a Samsung phone, they will be notified that they are being tracked, as an in-built anti-stalking countermeasure.
These take replaceable CR2032 batteries, which are currently on sale at Supercheap Auto, two bucks for a 10-pack.
Buy this and AirTag. Use it to stalk someone. What are the chances they carry both phones?