The Tracktor Safari Extension
...Amazon has millions of products with prices changing all the time. TheTracktor is a tracking app that lets you track items being sold on Amazon and sends you price drop notification whenever a price drops below a certain level. The Tracktor Extension for Safari embeds the price history of Amazon products directly under the listed price for instant and easy comparison.
Also available for Firefox and Chrome.
- Graphs would occasionally not display on certain Amazon pages.
Mac OS X 10.5.8 or laterSafari 5 or later