But I have no idea where you live, so that might not be a good option for you.
A bit south of Sweden. There are several online shop still indicating they have them in stock, but after contacting by phone they all say they ran out. If you can wait for shipment from China that may work. eventually. Using phones as USB webcam is a mess, require android debug systems, phones overheating, wrong sound source, 2 second latency, etc.
One of the largest retailers here (big enough to keep Amazon out of this country):
https://www.coolblue.nl/en/webcams except for the 2 most expensive, that whole page is "temporary sold out"
What about auction sites?
Tradera (swedish auction site big enought to keep Ebay out of Sweden, they have tried twice) has a a few.
Here's a cheap used one, (so far, ends tomorrow).
https://www.tradera.com/item/120326/395875964/logitech-quickcam-fusion-webkamera.
Here's another one, brand new and unopened.
https://www.tradera.com/item/120326/395684928/webcam-webkamera-logitech-c270-hd-ny-Post from SE to NL is pretty qiuck.