The prices of products listed on online shopping site like Amazon or Flipkart may vary every single day and here’s a simple Google Docs based solution to help you keep track of these price fluctuations via email.
The tool can track prices of all products listed on various Amazon websites (all Amazon.* country domains are supported) and Flipkart.com (if you are shopping in India).
For details on how to achieve this go to Digital Inspiration(http://www.labnol.org/internet/amazon-price-tracker/28156/)