Best Buy offers the Microsoft Wireless Mobile Mouse 3500 in Geode, model no. GMF-00017, for $9.99 plus free shipping. That's $7 under our April mention and the best deal we could find by $5. (It's also the lowest total price we've seen.) Sales tax is added where applicable. 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.