Meritline offers the Microsoft Arc Wireless Laser Mouse in Black, model no. ZJA-00001, for $24.95. Coupon code "MLCK227VNL1" drops it to $19.99. With free shipping, that's tied with our October mention and the lowest total price we could find by $7. This 4-button mouse features a folding design, snap-in USB micro transceiver, and more. Coupon expires after 100 uses.