MOD-Wii-ICSP-NUNCHUCK - Open Source Hardware Board
Wii Nunchuck Breakout Board / Adapter from milquetoast on Tindie
Amazon.com: 2pcs 1.8M 6ft Extension Cable for Nintendo NES Classic/Mini Edition Controller and Wii Nunchuck and Wii Classic Controller Extension Cords Extender (NES Classic Mini Extend Cable) : Video Games