Hi KJR2,
Thank you for reaching out to Microsoft Community.
Surface 3 charge using the micro USB port. Surface 3 has been continued including its accessories so we do not have Surface 3 chargers available. You may just check for third party micro USB chargers that meets the requirement supply for your Surface 3. You may check this page for more details: How to charge your Surface.
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Kind Regards,
Marrion Y.