Screen monitors you can buy for 100usd. I'm not sure every person in office has a standing desk, but ok, you can buy a cheap Ikea one for 100usd.

The rest you mentioned is under 100usd. You can use your phone camera and mic just fine.

I'm not sure where the thousands of dollars are coming from... You can if choose buy a monitor for 3000, but a 100 monitor is good enough.