Here's the cheapest guy who is selling it, it's pre built to the stage of the pictures. This seller also goes into a bit more detail about it
http://www.ebay.co.uk/itm/1-10-Alloy-Carbon-SAKURA-D4-RWD-Drift-Racing-Car-Frame-Body-Kit-KIT-D4RWD-/171996370282?hash=item280bc8556a:g:Ii0AAOSwkZhWQ~2q