The thread about "software scoring machine" made me think of this. Having just purchased a couple of 19" LCD monitors the other day for $99.00 each, it occured to me, that a fencing machine could be made without lights, etc, that used a computer monitor for all feedback of lights sound, time, score, priority, etc.
Each weapon and type of bout (5 touch, ten touch, 15 touch, team) could have an appropriate "screen" that included all the necessary information.
The fencing computer cost could be cut substantially and the size and quality of your display could vary with how much you wanted to spend on your monitor. A fencing computer that had a variety of tones and variable volume and brightness would be great at tournamnets or in a club setting.