@KMacD 

You don't need superior network speeds for printer, so you do have options. 

Powerline adapters make sense, but only if they can establish connection to each other. You would not know until you try. 

If there is WiFi signal from Main Deco near printer, you can add Satellite Deco there and hardwire printer to it. Most compatible and budget friendly should be X10 and X20. 

I would not recommend WiFi extender. 

  @KMacD 

There is also such thing as "wireless print server," you can check it on Amazon. They advertise it as a tool to convert USB or LAN printer to WiFi. 

This might be less expensive than X20, but I have not tried those and can't tell how well they do work with Deco mesh.