Happy you brought it up. I've been in and out of stereo photography for decades now. Initially I built a contraption with front-surface mirrors to expose two photos side-by-side on 35mm film. In later decades I tried dual digital cameras — at times even just sliding horizontally with a single digital camera (no moving images of course).

Fuji had a decent stereo camera years ago. I had one briefly but have been unable to find it for years now. I either misplaced it or it was stolen....

eBay is where I head now to find the Fuji cameras. But it is disappointing that there is not a current commercial stereo camera that I am aware of.

Perhaps someone can take the Pi and come up with something fairly high quality.