Cloudflare Users (Free to Join): YubiKey 5C NFC $11.60, YubiKey 5 NFC $10

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https://www.cloudflare.com/products/zero-trust/phishing-resistant-mfa/#HTMLIdYubicoOffer
Cloudflare Customers the YubiKey 5C NFC for $11.60 or the YubiKey 5 NFC for $10 when you claim the offer via your account. Shipping is free.