Where to find magic tag chip?

I’m looking for a magic ntag chip, any suggestions on where to find it for a fair price?
I need to copy some Tags completely, and the solution for them to have the same serial number is using a magic tag.

I need the cheapest and simplest model possible.

Thanks.

Last I checked I think KSEC @KaiCastledine has some magic ntag iso cards

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We do: https://labs.ksec.co.uk/product/magic-ntag-21x-ntag-i2c-mifare-ultralight-ev1-compatible-tag/