UGREEN FineTrack (iOS Only)Air Tracker Tags 4 Pack, 1-Year USB-C Rechargeable Battery Bluetooth Tracker Compatible with Apple Find My, Item Finder Smart Tag for Key Luggage - [Apple Find My Certified]

Go on Amazon and look up “Rechargeable findmy” and there are Bluetooth trackers that work in the Apple findmy app just like an airtag. These are essentially third party airtags but they don’t have the UWB chip for precision location. They are bluetooth. I have a rechargeable wallet card. Here is an example https://a.co/d/0fgCRrBi If you don’t need UWB they might be worth a shot. I use a few of them in addition to actual airtags mostly because they are really easy to remove the speaker from and they are really cheap but I never tired the rechargeable ones.