Groups.io (ex-Yahoo)

With Yahoo groups changing to a pure mailing list, many groups moved to Groups.io. There are (as of June 2020) 14 results for a search for stereoscopic

Notable ones are Photo-3D, Sell-3D, Viewmaster, and Fuji3D
Since it is against the rules to offer anything for sale in Photo-3D, you can use the group Sell-3D for selling.

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