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tleisher

Price Watch websites

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How do they do it? How does one website gather all the information on prices from all other forms of it on the internet? Is it that most places offer and XML/RSS feed to their product guides? Or does one person go around and find the prices?

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well, assuming they don't use XML/RSS

my first guess would be they're using one of the many product identifiers out there
For instance
ISBN
SKU
ASIN
UPC
and maybe GTIN

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But don't those give you the suggested retail price? Not the exact price of what each different company suggests?

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A large number of sites have an account with an 'Affiliate Network', merchants signed up to these networks can disribute their product database to the affiliates using XML, or CSV files.

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