sorry if this is a dumb question but im really confused about how people know when stuff goes on sale on amazon. im trying to buy a breville bambino for my new place in seattle next month since i move in on the 1st and my budget is super tight. i was thinking i could just keep the tab open and refresh it but then i realized i might miss it while im at work? my logic was that amazon would just tell me but i cant find a button for that anywhere... i saw people talking about extensions but im worried about getting a virus or something since i dont know how this works. are there any easy ones that are safe?