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For those who prefer buy things online, this little browser add-on might come in handy. InvisibleHand is a price comparison browser extension that is available for Firefox 3.5+, Google Chrome, Safari, and Internet Explorer.
InvisibleHand helps buyers, like you, when you are looking at an item on a particular online store by notifying you if there is cheaper one on another retailer. It is very easy to use, you just install it and InvisibleHand will work on the background and will appear if it finds useful data to display.
Here is an example quoted from TechSpot : Say you want to buy a digital camera and pick out a particular model on Amazon, for example. If the same product is available for less at buy.com (or any of the 220 retailers currently supported in the US, UK and Germany) InvisibleHand will show a discrete notification below the address bar with the price and link to the product page at the competing retailer.
InvisibleHand provides option to view all other results found. Very useful to compare all retailer’s price at once. According to the developer, InvisibleHand even knows the price of products when the retailer tries to hide it using add to cart mechanisms and the like.
A recent update said that the add-on also improved with the ability to display the cheapest of most convenient flight when you search for flights on a particular date and route using sites like Priceline, Expedia, or individual airlines.
If you are insterested to try InvisibleHand, feel free to navigate here.

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