You could put a strobe in place of the bulb but then you wouldn't need it to rotate. Circuitry for the strobe could easily fit inside the base if you take out the motor. This is an illegal mod to the light though, so don't do it for a competition robot.
There is a place in Chicago called the American Science Center that sells all kinds of stuff like that. Their website is
http://www.sciplus.com/
I am lucky they are just down the street from work. They also sell surplus motors and FP transmissions that look a lot like what are provided in the kits. Their stock varies from day to day.
Only a few more days...