I just learned about this website this moment. It apparently tracks a number of items that are often out of stock, at various vendors, and let you know when it is back in stock.
I have been attempting to get a reasonably priced Logitech WebCam, and have had one on backorder for a long time, but picked one up this morning. The person who notified me of the availability also told me about this website. It looks very good. You can do it by product.
https://www.nowinstock.net/
Here's the WebCam tracker:
https://www.nowinstock.net/computers/webcams/
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