Shop4Tech offers the Microsoft Wireless Mobile Mouse 3500 in Wave, model no. GMF-00018, for $11.75. Coupon code "GIFT15" drops it to $9.99. With free shipping, that's the lowest total price we could find for this mouse by $20, although we saw it in a differnt color for a buck less a week ago (since expired). This wireless mouse features BlueTrack technology (which purportedly works on more surfaces than optical or laser technology), a nano transceiver, on/off switch, and more. Coupon expires December 25.