Microsoft Store offers the Dell TP713 Wireless Touchpad for Windows 8, model no. X4YJC, for $29.97 with free shipping. That's the lowest total price we could find by $7, although we saw it for $10 less in February. Designed specifically for Windows 8, this 7.2-oz. wireless touchpad features an operating range of up to 32 feet, RF USB dongle, and 4-finger touch interactive computing. It requires two AAA batteries.