I would suggest a PWM controller to control the speed.  I'm not sure how
much they are to purchase, but if you're handy with electronics/programming,
you can make one on a microcontroller.  I made one on an Atmel
microcontroller that sets the PWM duty cycle based on serial commands.  If
you're interested I can send you the source for this.  The only parts you
need are an atmel micro, a max232 level shifter, and a few caps...  less
than $10 in parts

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