Exact prices change frequently, which is why only approximate ranges are listed.
$ - Under $5
$$ - Between $6 and $50
$$$ - Between $51 and $250
$$$$ - Over $250
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Schedlbauer, M. J., Pastel, R. L., & Heines, J. M. (2006, June). Effect of posture on target acquisition with a trackball and touch screen. In Information Technology Interfaces, 2006. 28th International Conference on(pp. 257-262). IEEE.
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Written by Harrison McNaughtan, Last Revision May 2018