Meritline offers the factory-refurbished Logitech Performance Mouse MX, model no. 910-001105, for $49.99. Coupon code "MLCKW11PNL1" cuts it to $39.99. With free shipping, that's $5 under our September mention of a refurb and the lowest total price we've seen for this mouse. (It's a current price low for a refurb by $5.) It features four thumb buttons, scroll wheel, Logitech unifying receiver dongle that allows the addition of a compatible wireless keyboard without multiple USB receivers, and more. Coupon expires after 100 uses. A 90-day Logitech warranty applies.