About $1000, +/- 150 ish depending on vendor/"who you know". Kit harness is something like another 2-300, same for Graves harness I believe. Difference is the Graves harness piggybacks on top of the stock harness, leaving the bike SS-legal (whereas the kit harness replaces the stock harness, which is not SS-legal).
hey guys, the 2009 R6 kit ecu is only $700 new from Graves and a "bit" cheaper from over out of Japan if you can wait. Graves have them in stock, Weston got us 2 2009 ones for customers. Just fyi. I'd still stay close to that price thou for used even (if in good shape) since they are hard to get as race season comes closer. Good luck with sale.