Newegg offers the refurbished Logitech Wireless Performance Mouse MX, model no. 910-001105, for $39.99 with free shipping. That's the lowest total price we could find for a refurb by $2 and tied with the lowest price we've seen for this mouse. (It's also $15 under the best price for a new one.) It features four thumb buttons, scroll wheel, and Logitech unifying receiver dongle that allows the addition of a compatible wireless keyboard without multiple USB receivers. Deal ends February 28.

A 90-day warranty applies, but it's unclear who backs it.