Logitech Couch Mouse M515 for PC or Mac for $19.99

Hand-activated: Mouse is active when you grip it, so it's only "On" when you use it. Made for couch- and desk-surfing: Sealed, easy-gliding base gives you accurate tracking on cushions, blankets and carpets. Effortless Logitech Hyper-Fast Scrolling: Coast smoothly through long web pages with a single spin. Extended battery life: Go for up to two years without a battery change. For Windows or Mac: Reliable wireless connection with tiny Logitech Unifying receiver that can stay in your laptop