Amazon offers Prime members the Logitech M705 Wireless Laser Mouse in Black, model no. 910-001935, for $19.99 with free shipping. (Non-Prime members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $8.41.) That's tied with our expired mention from this morning as the best price we've seen. (It's a current low by $15.) This right-hand wireless mouse claims to have a 3-year battery life and features a nano-receiver and scroll wheel.