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This Logitech T400 Zone Touch Wireless Optical Mouse drops from $39.99 to $14.99 at BestBuy.com. This is the best price we could find for this 4-button mouse by $13. It has a touchpad scroll wheel, an ambidextrous design and comes with a Unifying receiver that lets you connect up to 6 mice or keyboards to 1 USB port. Sales tax is charged in most states.