Available as an assembled Module and as a DIY project.
This Module is currently available.
LW format panel for CGS507 Serge '73 VCO'
LW format panel for CGS507 SERGE 73 VCO:
https://www.elby-designs.com/webtek/cgs/serge/cgs507/cgs507.htm
These merchants probably sell this module. Huh?