Wico Y-Cable. Price? Availability?

[MAC-42]

I picked up a light-6er lot on eBay and kinda scored a lucky find along with it: 3 working 5200 joysticks (!) and a 5200 Wico Command Control joystick. The Wico didn't come with a Y-cable, though. Any idea what one might cost me? And if one might be available? Thanks!