This Module is currently available.
8-1 mux/demux
This module is a simple mux / demux using the 8 to 1 or 1 to 8 DG408 analogue switch chip. It can either route 1 input into 8 outputs, decided by the 3 logic inputs, along with EN (a high signal will stop the chip from switching), or it can route 8 inputs into a single output.
These merchants probably sell this module. Huh?