not as easy as I think you're looking for.. but if you're willing to do the dirty work, there are plenty of these barebones systems
ARe there USB touchpads out there made for replacing the mouse on a regular desktop computer? Small touchpad only units that is....I keep finding keyboards with touchpads. I just need a touchpad that I don't have to rewire to hook up to a computer.
I'm certainly capable of doing that....but it looks like a PITA