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Invisble hand is a firefox extension that helps you make online purchases in a smarter way. It works in the background while you are surfing. Whenever you are browsing any e-shopping website it notifies you if the items you are looking for are available at cheaper prices on other sites in its network.
The sites monitored by the Invisible Hand include Amazon, Borders, Buy.com, Best Buy, NewEgg, as well as many others. It promises not to collect any information other than the items you are looking for.
It is possible that you can find a better deal for a product over what Invisible hand recommends but it is quite unlikely. Overall, it is a great tool for finding the best deals on the online purchases and it can save you a lot of money.
