Logitech M570  Wireless Trackball
Updated Jul 15, 2020

Amazon has Logitech M570 Wireless Trackball for $28.99. free shipping on orders over $25.
Free Two-Day Shipping for Amazon Prime Members. Your coffee table. Your favorite chair. Your comfy bed. Now there's no limit to where you can get precise cursor control. This hand-friendly wireless trackball lets you work and play wherever you want. No mouse to move around. No tricky keypad leaving your hand feeling cramped. Just roll the ball with your thumb and click. Precision never felt so comfortable. Thumb-operated trackball and laser sensor for smooth, precise cursor control. Works anywhere you do—even your sofa.