I’ve been writing about Apple’s Find My in general for years via my book Take Control of Find My and AirTags. https://www.takecontrolbooks.com/find-my-airtags/ Frustrated by being unable to find all the items with Find My Network support, I built a site! https://findyourtag.net (disclosure: affilaite links)
@glennf how can I add models?
@nicolai Let me know! There's an email link at the bottom. I didn’t set this up to be a wiki or user-contributed since I have come across some odd Find My stuff that i wouldn’t include (rare, but it happens).

@glennf

This one is sold for € 5.95 for one and € 14.95 for three in action stores in 14 countries across Europe

https://www.action.com/nl-nl/p/3221957/fresh-n-rebel-smartfinder/
https://www.action.com/nl-nl/p/3221953/fresh-n-rebel-smartfinders/

Fresh ’n Rebel smartfinder | Action NL

Vind snel je spullen terug met deze slimme tracker. Werkt met Google 'Vind-plek' en Apple 'Zoek mijn' voor nauwkeurige locatievolging. | Bezoek vandaag jouw favoriete Action winkel in Nederland!

Action.com
@nicolai I figured out a way to include it so that is accurate about how to get it! Thanks! https://findyourtag.net/product/fresh-n-rebel-smartfinder
Fresh 'n Rebel SmartFinder by Fresh 'n Rebel — FindYourTag

Ultra-budget dual-platform tracker available in-store at Action (Europe only) Works with both Apple Find My and Google Find My Device. Available in...

FindYourTag
@glennf great. Thank you. These are not much but they are very cheap and that is a feature on its own, especially for everyday items like sport bags, backpacks, tool boxes, dogs, keys, kid toys, bicycles, …