Available as an assembled Module and as a DIY project.
This Module is currently available.
3 channel active mixer
The AMIX is a three channel (active) powered mixer in 2HP for Eurorack. Great for both Audio and CV sources. Max gain of 1.
https://www.eurorackhardware.com/AMIX--Powered-Mixer_p_42.html
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These merchants probably sell this module. Huh?
Eurorack Hardware AMIX - Active Audio