Available as an assembled Module and as a DIY project.
This Module is currently available.
Noise Generator
The ES05 produces WHITE and PINK noise waveforms while the S&H SOURCE output produces the necessary input for a sample and hold function to produce equi-probable random voltages, similar to a 1/F distribution function.
Additionally, the ES05 features a random voltage output, RANDOM OUT, which can be stepped through random voltages either by an external TRIGGER or by the MANUAL button on the panel.
https://www.elby-designs.com/webtek/euro-serge/es05-noise-source/es05.htm
These merchants probably sell this module. Huh?