I finally found a wallet tracker that works as well as an AirTag (and it's under $20)
Briefly

The SwitchBot Wallet Tracker Card, currently on sale for $20 with a Presidents' Day discount, aims to help users keep track of their wallets and keys. At only 2.5 mm thick, it easily fits into standard wallets and boasts up to three years of battery life. However, it can only connect through the Apple Find My network, making it unusable for Android users. Compared to Apple's AirTag, the SwitchBot offers better durability with an IP67 rating, but lacks a replaceable or rechargeable battery, limiting its long-term usage longevity.
This SwitchBot tracker is a reliable alternative to Apple AirTag for wallet tracking, offering a slim design and excellent battery performance, albeit limited to Apple devices.
With a thickness of just 2.5 mm, the SwitchBot Wallet Tracker Card fits seamlessly into your wallet, making it both functional and convenient to use.
Read at ZDNET
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