iTech Deals offers the Dell TP713 Wireless Touchpad for Windows 8 for $10.49. Coupon code "DELLPAD" drops it to $8.49. With free shipping, that's a buck under our mention from ten days ago as the lowest total price we've seen. (It's a current low by $5, excluding the mention below.) 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.
A close price: Altatac via Rakuten Shopping offers it for $8.99 with free shipping.