Available as an assembled Module and as a DIY project.
This Module is currently available.
Dual passive ring modulator
RING is a 4HP dual passive Ring modulator for Eurorack. Ring modulation is an essential 'effect' in modular synthesis. You get two independent channels of the classic two transformer and 4 germanium analog ring modulation design.
https://www.eurorackhardware.com/RING--Dual-Ring-Modulator_p_44.html
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These merchants probably sell this module. Huh?
Eurorack Hardware RING - Dual Ring
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Eurorack Hardware Ring!