Available as an assembled Module and as a DIY project.
No info about availability.
DIY Synth Voice
Erica Synths DIY Synth Voice consists of all essential blocks for versatile monosynth, and is 100% patchable for even more control options. It has digital/analogue design - VCO and envelope generators/LFOs are digital, other parts are analogue.
http://www.ericasynths.lv/en/shop/diy/diy-kits-1/diy-synth-voice/
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These merchants probably sell this module. Huh?