The best stereo camera for linux is probably around 50,000-100,000USD. For some reason I don't think that is really what you are looking for.
Everything for linux will be painful, in the beginning. After more users use the device the pain gets less. That being said, there are just now new stereo cameras showing up for Windows. Mac usage will shortly follow, then Linux.
For example search Intel RealSense, and Creative Senz3D. Creative is supplying for Intel, so I suspect the Senz3D is being replaced. But at this moment, neither are that popular even on Windows, and certainly would be more 'painful' on Linux than a Kinect.
The depth sensor portion is almost always done in software, not the camera (including on the Kinect). It may be in the driver where you dont see it, but the difficulty of doing it on the device would add considerable expense.
From the Currra web site;
CURRERA-R: was discontinued
It was decided to support the produced units, but discontinue further development of current model.
You might find one cheap on eBay.
There are some things around the corner, including something my company is working on, but I dont want to announce vaporware.