Best Buy offers the Microsoft Sculpt Touch Wireless Mouse in Navy, model no. 6PL-00003, for $24.99 with free shipping. (Amazon charges the same for its Prime members.) That's the lowest total price we could find by $10. It features BlueTrack technology and works on a range of surfaces, a touchstrip which allows 4-way vertical and horizontal scrolling, and 16.4-foot operating range.