Price!pinx allows online shoppers to get notified about price drops on pretty much any online retail website, i.e. Amazon, Best Buy, Nordstrom, Macys, etc:
Price!pinx allows you to get price drop alerts for any product on almost any retailer’s website. You can also create Amazon price alerts and track prices. Their free service smoothly integrates into your online shopping experience by using a smart bookmarklet. It’s free and really easy to use.
Furthermore you can compare Amazon products side by side: http://pricepinx.com/Compare
This is FREE! Try it out, I use it! This is not sponsored!
This is an interesting free service. Everyone likes to save money.