USBJoy2.0 - adapter. Connect your Atari Amiga C64 joystick to PC! Develop your own usb device! - Polish electronics for 3D printers, CNC, robotics, retro computers
SPEEDLINK Competition Pro USB Joystick + Game Collection 99 best of C64 Classix - iPon - hardware and software news, reviews, webshop, forum
THEC64
Competition Pro USB Joystick + '99 Best of C64 Classix®' Games Collection, Jöllenbeck GmbH, Press release - PresseBox
USB Joystick Adapters – breadbox64.com
Homemade USB adapter for 9 pin Atari C64 Amiga Joysticks - YouTube
Amazon.com: The C64 Micro Switch Joystick (Electronic Games) : Video Games
Amazon.com: Retro Games The C64 USB Joystick for PC : Video Games
C64 USB Joystick Adapter
Retronics USB Joystick Adapter and Other Coolness with V-USB | Code and Life