Free Wikibuy for Chrome
Visit a product page on Amazon and Wikibuy automatically goes to work in the background. If a better offer is found, a notification will pop up in the lower left hand corner of your window in less than ten seconds.
Wikibuy shows you the final price of the item, including sales tax and shipping, and also notifies you of the delivery date.
If you want to buy the item with the better price, you can checkout on Wikibuy too.
good deal, thanks.