Prism Circuits specialise in Serge format modules, remaining true to the original Serge modules. They are DIY systems and aim to bring affordable Serge to the people.
The modules are available online https://prismcircuits.net with links to the parts lists to make it simple to build. Because they are paper front panels you can print them yourself. They are also available as prebuilt systems pre-designed or customized.
Older Music Machines & the People Who Still Use Them