Smoothieboard is now from sale from the US ( by Logxen, Smoothie/Smoothieboard/Smoothiepanel dev ) and Europe ( by Arthur, Smoothie/Smoothieboard dev ).
Europe and rest of the world
Smoothieboard is OpenHardware.
You are free to use it, make it, sell it, modify it ( as long as you release the changes under the same license ).
If you want to make it yourself and use the Smoothie* namespace, you want to take a look here.