This deal has ended.
This Microsoft 5 Button Comfort Mouse drops from $29.99 to $19.99 and then to $7.99 via code EMCNBGJ66 at Newegg. With free shipping, this is the best deal we could find by $14. It features BlueTrack technology so that you can use it on most any surface. There is no sales tax (except CA, NJ, and TN).