Module is available as a DIY project only.
No info about availability.
x0x Heart (Grayscale panel) xOx
DIY panel for the x0x Heart from Open Music Labs:
The x0x-heart is the heart of the x0xb0x, surgically extracted from the x0xb0x to be transplanted into your designs. The x0xb0x is a faithful replica of the Roland TB-303, complete with sequencer and DIN/MIDI/USB. The x0x-heart is just the analog section of the TB-303, replicated with SMT components, and made small enough to fit into a Eurorack modular format. It even has a Eurorack power header on it. Also spelled xOx Heart (for search).
Now available exclusive from SynthCube:
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These merchants probably sell this module. Huh?