This Module is currently available.
Subharmonic Generator + Ring Modulation
SUB+RM is a 2-in-1 analog effects module for Eurorack modular synthesizers.
SUB = subharmonic generator, primarily designed for sub-octaves but will behave differently (output different sub-harmonic notes) depending on input waveform and how hard you drive the input/dry level
RM = Ring modulation. Classic four-quadrant multiplier
https://www.etsy.com/listing/1645280071/subrm-analog-audio-effects
These merchants probably sell this module. Huh?