Available as an assembled Module and as a DIY project.
This Module is currently available.
Analog Memory Cell
The Analog Shift Register is a 3 stage memory cell that passes each voltage down from the previous stage to the next stage in the chain.
This module is scheduled to be released in February-March.
https://prismcircuits.net/products/serge-modular-analog-shift-register
These merchants probably sell this module. Huh?