Hi, Dr. PF!
Thanks for reaching Microsoft Community. You can check out our page to see the official Surface 44W Power Supply but it seems to be out of stock. You can also Contact Microsoft Support for replacement options.
Also refer to this page to check the wattage of the corresponding Surface Pro 6. A table is supplied on this page where you will learn how to charge your Surface.
15 volts @ 2.58 amps=39 watts | 5 volts @ 1 amp=5 watts | 44 watts |
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As long as those charges have those specs, you may purchase it.
We hope this helps you out, we highly encourage you to inform our Community by clicking on Yes or marking my post as an answer. This will help other members who may have the same issue as you. Otherwise, don't hesitate to update us so we can further assist you.
Kind regards,
Janette_Z