are you looking for the nitro, or the brushless version?
may be able to find a used nitro version....but the brushless ones are pretty new and it will be hard to find a used one.

also, i dont reccomend a used nitro...no matter what model. the chances are just too high IMO that the previous owner didnt take care of the motor right. in which case, you will just be buying a headache.
now, if you found a used roller at a really good price, and bought a new motor thats a different story.
with nitros, New is the way to go IMO.