Price comparison
Another known use case is to find specific products or services sold through various websites and track their prices. You would be able to see who sells the item, who has the lowest price, or when it is most likely to be in stock. You might even be interested in similar products from different sources. Having a web scraper periodically visit websites to monitor these products and services would be easily solve this problem. This is very similar to tracking prices for flights, hotels, and rental cars as well.
Sites like camelcamelcamel (https://camelcamelcamel.com/) build their business model around such a case. According to their blog post explaining how their system works, they actively collect pricing information from multiple ...
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