I understand that the NES Classic is meant to feel as authentic as possible, but really, I’d be okay breaking the illusion to use a wireless controller. 8Bitdo makes a wireless controller designed just for the NES Classic, with the same nightmarishly pointy rectangular design, and it’s just $22 on Amazon today. It even includes Turbo A and B buttons, if you’re a dirty cheater.
Still need an NES Classic? They’re in stock right here.