Amazon reportedly used a secret algorithm to jack up prices — A new report details Amazon’s Project Nessie pricing algorithm::Amazon deployed a secret algorithm to gauge how high it could raise prices before its competitors stopped increasing their prices as well.
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You should check out CamelCamelCamel or Keepa, it has Amazon price history.
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The 3xCamel works for all these: UK, Germany, France, Italy, Spain, Australia, Canada and US. Sometimes the prices differ for the same products across the EU country versions, so it can be worth comparing them before buying in/from EU.
wow they will make money helping consumerz for now
There is an extention and phone app called Keepa that tracks prices and shows you their price history right on the product page on Amazon so you can see if you are getting a good deal.