Logitech offers the Logitech Performance Mouse MX Wireless Laser Mouse, model no. 910-001105, for $99.99. Coupon code “logi_pmmx_7511” drops it to $53.99. With free shipping, that’s $3 under our April mention (which was after rebate) and the lowest total price we could find by $21. 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 is a “dented box” item; although the box may be scratched or dented, the contents are new with a full Logitech warranty.