GearBest.com has A888 6D USB Wired Optical Gaming Mouse on sale for $6.20.
Shipping is free.
– High-end optical engine, precise positioning
– 6 buttons, including scroll wheel, left button, right button, advance, retreat, DPI switcher
– Adjustable 1200 / 1600 / 2400 / 3200 / 5500DPI
– Ergonomic design, comfortable touch, long-term use without fatigue
– Intelligent connectivity, plug and play
– Long switch life up to 10 million
– Total 7 bright colors showing in turns, giving you a colorful visual effect
– Suitable for all the people, especially for high-end gaming professional players
– Support System: Windows 7 / 8 / 2000 / XP / Vista / Mac OS etc.