Amazon has the Cooler Master MM310 Gaming Mouse (White) on sale for $19.14 - $15 rebate [Exp 05/27] = $4.14 with free shipping on $25+ or with Prime. The black model is $4.94 after rebate. 

• Rebate must be mailed in by 6/26, most people report receiving rebate in 2 to 3 months.