I did a cursory Google and didn't see any usable Betson trackballs at that price, they appear to be closer to $100. Also, they seem to be primarily designed for installation into a cab - whereas the desktop models are ideally suited for those of us who play at desks, or seated on couches.
Still, each to their own. I actually think Tempest works great on a trackball. Or at least, a trackball is a massive improvement over a keyboard or joystick.
On mastering Marble Madness - I've been playing Space Invaders for coming on 40 years, and I've not mastered it yet.
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