Tell about scraping method for deals
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By using scraping someone can get complete amazon flipkart like sites data and can sort product according to there choice.
by using this someone
can also get alert about huge Price drop.
but i dnt know how its work
can a Normal person can also use this or not- Sort By
Those won’t work either for the purpose OP wants it.
They may work for a few pre-selected products where we select 4-5 products to watch and scraper check the price in regular interval of maybe 1 min and notify us. And if they work for bulk then I am pretty sure they won’t make fresh requests on Amazon. Maybe they fetch it from cache or from their own database.
Let’s assume that Amazon has 1 million products. If we check prices of 1 M products every minute then it will require us to make 16,666 hits on Amazon website every second. That’s considerable amount of hits. It can easily be seen as DDOS attack.
Some secrets should remain secrets for the maximum available time, till they get scraped by their own or some better takeover (alternative).
It’s like freedom.. everyone likes to have it, but not all can handle it. 
Did your teacher tell you like that only in class when you asked a doubt 
There are chrome extensions available for web scrapers.
you can check on youtube for how to use them.