Is there like a specific Cospaces VR headsets on amazon?
As far as I know, coSpaces works with Oculus Go/GearVR (https://www.oculus.com/experiences/go/1161600253887998/), as well as integrated with ClassVR (https://www.classvr.com/create-and-explore-3d-worlds-in-the-classroom-with-cospaces-and-classvr/ ).
Of course, the smartphone-based Google Cardboard also works.
There are ways to integrate the oculus Quest and Rift through the web browser in the system (more @ https://cospaces.io/edu/tech-check.html), but other devices, such as HTC Vive - do not work yet or are discontinued (DayDream).
In any case, it is interesting to keep coming back to this for new developments.