No info about availability.
Dual Passive Signal Splitter
A passive utility module with two independent sections of four linked jacks. Each section of the Multiple module splits an incoming signal into three copies. This allows one audio or CV signal to be sent to several destinations at once.
http://www.studioelectronics.com/products/synths/boomstar-modular/multiple/#modstar
These merchants probably sell this module. Huh?