The Mac Index indexes Apple website and compare prices of Apple products in different countries, against recent currency exchange rate. It’s like The Big Mac Index of Macs (and iPhones, and iPads). Useful when you're traveling somewhere and wanted to check if they have your favorite Apple product cheaper than if you buy at home.
Camel Camel Camel is a price tracker that makes sure you're getting the best deals! You do not even need to make a registration to track your desirable products' prices, you can do that if you want to get alerts. And if you have created a Wishlist in your Amazon account, it watched the price history of all the items that you have not purchased yet.