As one of its daily deals, Amazon offers Prime members the Microsoft Sculpt Comfort Bluetooth Mouse, model no. H3S-00003, for $17.56 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping adds $8.35.) That's the lowest total price we could find by $3. It works on a range of surfaces and features BlueTrack technology, and 4-way vertical and horizontal scrolling. It requires two AA batteries (included). Deal ends today.