How and where do I get a security key?

Ashley5918 Siad:

"how and Where can I get a security key and how much are they?"

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You need to create one. Go here: About Security Keys for Apple ID - Apple Support

Ashley5918 Siad:

"how and Where can I get a security key and how much are they? [...]I went there already…"

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OK --so purchase a 16GB flash drive, and proceed form there with the creation.