It comes with one.
My coppermix has been in the car since 2005. Over 350 launches, 7000 rpm plus launches. Started life holding 370 kw, now holding 470 rwkw. No rebuilds, no slipping, no nothing. Set and forget.
With the Yen so weak ATM, you should be able to have one at your doorstep for under $2k. You even get a Nismo sticker!!!!!