Best Buy offers the Microsoft Wireless Mobile Mouse 3500 in Ultramarine Blue, model no. GMF-00086, for $9.99 with free shipping. That's $5 under last month's mention of a different color and the lowest total price we could find in this color by $19. 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.