Miops PC Sync Cable For Flash Units CABLE-FLASH B&H Photo Video
Amazon.com : Foto&Tech Male to Male M-M Flash PC Sync Cable Cord 12-Inch Coiled Cord with Screw Lock Compatible with Nikon, Canon, and Most DSLR Cameras Flash Trigger (Male to Male Flash
What is/does flash sync port do? -- Flash and Studio Lighting in photography-on-the.net forums