Apple’s current Safari release includes Notify Me, which can track changes on a webpage and alert you when something important changes, such as a product returning to stock or a price moving. This is an overlooked way to convert a discovery feed into a useful follow-up system.
Pick one specific item with a real purchase decision attached: a large TV, a 3D-printing accessory or a replacement part. Open the product page in Safari and look for the Notify Me capability if available on your device and site. Not every page or account will expose the same behavior, and a notification is not a substitute for checking seller quality or model numbers.
Do this: test it on one product you would actually buy. If the alert works reliably, stop refreshing that page yourself.