Today only, Amazon lowers the price of this Microsoft Arc Touch Mouse from $49.95 to $36.49 with free shipping. This is the lowest total price we could find by $11. This mouse features a curved design for comfort while in use, and also flattens for easier transport. It works up to 30' away from the nano receiver and features bluetrack technology, so it can be used on almost any surface besides glass or mirrors. Sales tax is only charged in KS, KY, ND, NY, and WA.