I am looking for a website/application that will allow me to monitor some airport or airports in some area and send me the deals when something is interesting (much cheaper than average) to my mail.
Example: I am located in Rome and I don't know where I want to go, but I want the flight to be at least 50% cheaper than an average price of that flight. And if some flight suddenly became that cheap e.g. to Madrid or Budapest or London, I get an email or some other message or something like that.
Or if no email/mesaging is available, than a website where I select some airport and it shows me some good deals for low-coast flights from that airport in the next couple of days or weeks, that would be great too.
Any idea if something like that exists?