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Banggood has Xiaomi Bluetooth 4.0 2.4G Wireless Dual Modes Portable Mouse on sale for $ 15.99 w/ coupon code 15mimouse.

Shipping is free.

http://www.banggood.com/Original-Xiaomi-Bluetooth-4_0-Wireless-Portable-Mouse-p-1102766.html?rmmds=cart