Are you responsible for monitoring websites? How do you manage this?

It's often possible to use the same pages—for example, product prices.

It's straightforward, and it's easy to miss a change.

I'm curious how others handle this:

Do you check, and how often?

Have you tried any tools? Does it work?

What websites do you monitor most often?

I'm not promoting anything—I'm just trying to understand if this is a common problem or just a mine.