Web search mechanism

By trevanw ·
Hello, I am wondering if anyone knows of a web program or software search function which can help with the following:
A web search program which can carry out a specific search for a given item, and then do the same search at a later date/time. The difference in search results to be summarized into a list for further investigation.
For example, I would like to see if a new 1998 Saturn SC2, 1998 BMW 320i, 1998 Ford Explorer vehicle comes online for sale. Each week I would like an internet search to be run, and if there are any changes in web results produced from the prior week’s search, then these changes are highlighted and listed for investigation.
- Ability to search for a specific item which is online
- Searches to be done periodically, and results which vary from the previous search are summarized noting only the changes in the web search result, from the prior change
- Searches would be carried out globally and be exhaustive on all internet sites and content (very deep search)
If anyone knows a search tool or program that does this, I would appreciate you letting me know.

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