USB controlled water pump?

I am looking for a small water pump that I can turn on and off using a computer, preferably via USB. If someone could please post a link or a method of me doing this myself, I will be very appreciative.

Answer:

find the output positive and negative on the usb cable attach these to a solenoid or a relay. then attach the source that will power the pump to the pump, using the solenoid/relays contact pins as you would a switch. done. now just write a program on your CPU to control the usb output. for a diagram, email me at Ben@ Comcast

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I'd look for a USB IO module, add a relay, and switch a standard pump.