For its newsletter subscribers only, newegg offers the Microsoft Wireless Mobile Mouse 3500 in Gold, model no. GMF-00046, for $19.99. Coupon code "EMCNHHG37" cuts it to $9.99. With free shipping, that's tied with our December mention and the lowest total price we could find now by $4. 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. Deal ends February 25.