Can I add product pages from any store?

Most public product pages can be tracked. Some store layouts may occasionally require a manual re-check or admin review.

Will the service show older prices when I add a product today?

No. Price history starts when the watch begins, and every later check is stored from that point onward.

Is shipping cost tracked too?

When a store exposes it clearly, the system can store it. If not, you can add an estimated shipping value yourself.

Do I get notified about every drop?

Only if you want to. You can choose broad alerts or limit them to target prices, percentage changes, new lows or stock conditions.