I’ve yet to come across any brand that claims to sell an AirTag along with a wallet as included. If any brand claims to also sell both a wallet and AirTag together then I’d be very conscious of it being a potential scam.
Apple is very picky with who is and isn’t allowed to become official retailers so if it seems too good to be true it probably is. None of the wallets recommended in this article come with an AirTag and these need to be bought separately.