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recommendations for a response box with a knob

Hi all,

I want to do a lateralization study where the users indicate the location of a stimulus by turning a knob (a low-rent version of a pointer).  Does anyone know of such devices with a USB port that are reasonably priced (i.e. cheap?).  Thanks for all suggestions.
Brian Gygi, Ph.D.
Speech and Hearing Research
Veterans Affairs Northern California Health Care System
150 Muir Road
Martinez, CA 94553
(925) 372-2000 x5653