Prudent Way USB to Dual PS2 Adapter PWI-USB-PS2 B&H Photo Video
Amazon.com: PS2 to USB Female,PS/2 Male Converter Changer Adapter for Keyboard Mouse 2pcs by Oxusbor(Notice:Can't Match All Motherboard,Have Matching Problem) : Electronics
StarTech.com USB to PS/2 Adapter - Keyboard and Mouse - Keyboard Adapter - USBPS2PC - -
USB 2.0 Adapter - USB A Female to PS/2 Male - 5 Pack | Computer Cable Store
Monoprice USB to PS/2 Dual PS2 Converter Adapter - Monoprice.com
Amazon.com: Mcbazel Playstation 2 Controller to USB Adapter for PC or Playstation 3 Converter Cable for Sony DualShock PS2 PS3 Controllers (NOT Compatible with Dancing Mat Guitar Hero) : Video Games