I got mine for 15 bucks at Fry's Electronics. Haven't seen them anywhere else. It's made by some no-name Chinese company and it's got a cheap plasticky feel, but it works pretty well. The trigger acts as a left button, along with left and right buttons above the trackball. It works well with USB Overdrive, where I set the right button to be a Drag Lock button, otherwise dragging with this trackball is a pain.