Recommendation? Eye Tracking Device for Usability Test

Hi,

We are researching about possibly purchasing eye tracking devices
(hardware and software) for usability tests. Any information about the following (or other
related information) is really appreciated:

- What are some of the companies you might recommend that are
selling these devices?

- What is the average cost?

- How easy or difficult is it to set up and use the device?

Thank you,
Shima

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