I've used CCC for a long time, but especially in the pandemic I've discovered it's been most useful for simply finding out when something comes back in stock.

Whether toilet paper, a webcam, or whatever random thing that's been out of stock for a month -- set a CCC alert at some fairly high price and it'll e-mail you when it's back (below that price) -- even if the price you set is higher than it's ever been before.

I'm actually really surprised they haven't bothered to make that functionality explicit -- since it's not obvious that it will work -- and it's so valuable especially now.

(Confusingly, sometimes Amazon pages for out-of-stock items include a button to notify when something is back in stock, but most don't. They just say "we don't know if or when this will be in stock.")

I've become so reliant on CCC it really bugs me I can't use it (or an equivalent) on other sites -- e.g. Target, Wal-Mart, Best Buy, Nike, J. Crew, whatever.