Not quite sure how to word this...
I've heard that there is some kind of tool that can alert you in the event of a web page change. In my case, I'd like to be alerted when a hard-to-buy item comes back into stock.
For example, there is a widget being sold on site XYZ.com (for example). It is very popular and very rarely in stock. When the vendor does get inventory and updates their web page to "in stock", or if the price changes, I'd like to be alerted.
Is this possible?