Hey Ralph, I have a manual one and it works wonders! Don't get me wrong, an electric one would be awesome but I couldn't flip the bill on one of those babies, I recall them being like $700-1000. Is that what you're seeing out there?
I will say that the manual one moves my Hallett around just fine. One trick i've noticed too is that if you need to make a tight turn you should wet down the area so the dual axle trailer tires can slip around a bit more than if they were dry.
Good luck on your serach.