For those of you who have heard of it, I am going to attempt making one myself, if anyone is interested let me know, I can send you the plans and photos once its built, will also let you know how well it works once it's been 'tested' For those who don't know what it is, just google it.
I think that's an awesome idea. I think they run for a 1000 U.S. dollars. So what are you going to use as a motor?
Going to rig up a 12v electric motor, tack weld a biased weight onto the drive shaft. The action of the rotating weight at high revs will make the assembly vibrate, voltage to the motor controlled via a 'volume' knob and also an oscillator so I can create interesting vibration patterns.