Amazon offers the Logitech Performance Mouse MX, model no. 910-001105, for $59.99. With free shipping, that's the lowest total price we could find by $25, although it was $7 less in August (since expired). 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.

Note that this item will ship on or around September 16.