Logitech G400s 4000DPI Optical Gaming Mouse for $31.99. Shipping is free on orders over $35. If needed, use this Filler Tool to pad the order for free shipping. Here is a screenshot for your reference. It features 4000 DPI Delta Zero Optical Sensor, 8 programmable buttons, long-life buttons rated to 20 million clicks, and culpted comfort grip. Most places have this gaming mouse for about $39.