Microsoft Store offers its Microsoft Wireless Mobile Mouse 1000 in Blue or Red, bundled with $2.50 in Skype Credit for $9.95 with free shipping. (The Skype credit will appear in cart automatically; it converts to up to 100 minutes.) That's the lowest price we could find for the mouse alone by $8. It features 1,000 DPI tracking and a purported battery life time of up to 10 months.