Thought this might be helpful to someone:
Microsoft Insiders Newsletter just announced the Logitech BRIO 4K Ultra HD Webcam is going to be 20% off on their Microsoft Online Store for Dec 10-16th only.
This is one of the few webcams that supports Windows Hello, a facial login feature of Windows 10. It is also highly reviewed as a 4K Webcam too.
Here is the link to the store page,but price will not be reflected until the 10th.