For now, you can only get the Tuners at Hobby Lobby. They are kindof a special/rare/exclusive-Hobby-Lobby thing. They have Supra's and Acura RSX's at the moment. I'm sure they will release more later on though.
As far as running good, they have a good battery that can take around five 45 second charges for a good 20 minute run. They are also pretty fast on my wood floor
. The steering is a little off, but that can be adjusted pretty easily by the switch on the bottom.
Lots of fun, you should check them out.
Edit: These are exactly the same size as the normal SS Tuners... 1/64. They look exactly the same but they just have a wire sticking up out of the back window. Pretty cool.