Walmart offers the Microsoft Touch BlueTrack Multi-Touch Mouse in Black, model no. 3KJ-00001, for $16.35. Opt for in-store pickup to avoid the $4.97 shipping charge. That's the lowest price we could find by $7, although we saw it for slightly less last month. This mouse is sensitive to 1-, 2-, and 3-fingered gestures and features BlueTrack technology, 10-foot range, and 1,000 dpi. It requires Windows 7 or 8.