Are there any Wi-Fi Range extenders that use POE for power?

Hi onlyjohn, and welcome to the Apple (user-to-user) Community!

Re: "Wi-Fi range extenders : Are there any Wi-Fi Range extenders that use POE for power?"

Am no expert in this area, and have no experience with POE. Perhaps getting your discussion topic underway may help bring you more informed replies:

Apple support have articles online that may or may not be helpful (apologies if you have already seen these):

Eg: How to: Extend an existing Wi-Fi network in AirPort Utility on Mac - Apple Support.

and:

Cables you can connect to your AirPort base station - Apple Support

or:

How to: Optimize your Wi-Fi networks for Apple devices - Apple Support

All the best :-)