Can anyone recommend a mid range one *known* to work with Linux, including
Jack audio?

Hmm, not sure what "mid range" means, but I have a Logitech QuickCam Pro 9000 that works.

https://support.logi.com/hc/en-us/articles/360023465073-QuickCam-Pro-9000-Technical-Specifications

It's pretty old, don't know if it's still available or not. But my general experience with Logitech is they make great products.

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