Low cost webcam that works with AppleTV?

Can I get some recommendations for a low-cost webcam to get to mount on my TV in the living room that I can use with FaceTime on my AppleTV? (don’t have a spare iPhone to use)

I’ve not seen anything which says that you can just plug a webcam in. I thought it had to be an iPhone.

Do AppleTVs even have a USB port to plug a webcam into?

You’re completely right, I just checked our 4K and it doesn’t. For the OP, please be aware that you don’t need an iPhone to be dedicated to stay with the Apple TV, it uses continuity camera temporarily.