No info about availability.
Output module and headphone amp
Provides two 1/4'' jack outputs, and a stereo headphone amp, with master level, and a dedicated headphone level, all in just 4 HP. Based on YuSynth output module.
http://www.smugrik.org/synthesizer-modules/output/
Included in 22 Racks, 18 are public:
Befaco/Divkid OUTPUT BUS
Befaco Output V3
Befaco Output
Befaco Output V2 Eurorack Synthesizer
Erica Synths Output v2 Stereo Mixer
Divkid Output Bus