Ultrasonic finder

Does any one know if we can us a ultrasonic range finder in the robot?
Are programmers would like to us it for shooting.

No rule excludes it, many teams have used them in the past.

AndyMark even sells some:

Thank you

There is also a 35 dollar voucher included in your KoP from MaxBotix for 35 dollars. They sell ultrasonic sensors.