$400, used, and missing parts.... man have we got to talk. Don't go to CL for the harness or the solenoid; don't cheap out on critical components.
Meanwhile.... do you need any other parts?
Seriously though, Greddy doesn't sell direct, there's a link above for authorized dealers. OR Google the part number along with the name "Greddy 15900535" and you'll find a number of retailers offering it for under $90 (as you well know, look up reviews before dealing with any online shop).