Newegg has the Corsair Vengeance M90 15-Button USB Laser MMO/RTS Mouse for $50 - 15% off with coupon code EMCJNHE49
[Exp 10/31] - $15 rebate
[Exp 10/25] = $27
with free shipping. Features 5700dpi Avago ADNS-9500 LaserStream sensor, 15 fully programmable buttons with nine macro keys, metal chassis design, and tracking up to 165" per second.