USB Joystick Adapter from Retronic Design on Tindie
C64 Joystick Adapter - Share Project - PCBWay
9 Pin Joystick to USB Adapter
Amazon.com: The C64 Micro Switch Joystick (Electronic Games) : Video Games
USB Joystick Adapters – breadbox64.com
Commodore 64 Joystick Mouse Controller Pad C64 9 Pin Extension Cable Lead - UK | eBay
DB9 joystick to USB adapter acting weird on C64 : r/c64
9 Pin Joystick to USB Adapter
USBJoy2.0E adapter - Extended Version. Connect your Atari Amiga C64 joystick to PC! Develop your own usb device! - Polish electronics for 3D printers, CNC, robotics, retro computers