The price applies only while stocks last, normal price is in excess of $300 US dollars at which it is still a bargain.
I think it hasn't been selling simply because the website is impossible to find by normal search methods.
The Code7 Stepper Controller is ideal for two quite separate sets of interested Meccano enthusiasts:
"Those who would like to make a computer controlled model but do not wish to get involved in the intricacies of computer progamming and those that do."
Have a look at the videos, Enrique Nivasch single-handedly designed the whole thing driven by the idea that we really should have computer control for our models, a very nice guy.
For those that don't want to get into programming, the controller has a 'teaching' mode.
It learns what to do while the model is being controlled manually from the control panel displayed on your PC.
More specifically, it learns to follow a sequence of positions of the four motors. For example, with a derricking grab (Slew, luff, hoist, open/close):
First position. Grab closed on the ground at a specific point.
Second position. Grab open over an object in a particular place.
Third position. Grab open on the ground around the object.
Fourth position. Grab closed
......and so on.
You might take some time to manually maneuvre the grab into the second position. The controller will then do it one smooth step!
If you want to get into programming, you can program your own user interface in C# which makes this product pretty well unique.
The complete IDE is available as a free download from Microsoft, one of their many charitable ventures.
With a PC I/O board you are into sensing as well as control.
I must now admit to only vaguely knowing what I am talking about but have so far downloaded the IDE and written a few simple programs.