Manual:Hardware where to get
As of today, we are still using STM32F4DISCOVERY evaluation board as the brain of our prototypes. Work is still in progress on our own main chip board. You would be programming and powering the brain board using a mini-USB cable (one comes with discovery) and you would be connecting to it using a micro-usb cable (that's your average Android phone cable)
In addition to the brain board you would also need rusEfi boards for signal input and output.
While we are doing our best to supply all the boards with a full Bill Of Material (BOM), sometimes it's cheaper to buy some generic stuff on eBay. More on that in our recommended shopping list.
You would need to assemble most of this yourself. We have some soldering hints for you.
You can order some of the boards at our store @ Tindie