That's right around what I would expect from a well put together kit that includes a properly designed hub outlet vent (JDM pricing anyway). A locally made kit might be a $100 to $200 cheaper.

Expect to pay $60-$100 just for the high temp vent hoses if putting together a kit yourself. Fang vents would be pretty easy to make from stock parts, and Nasa ducts would be easy to integrate into the undershroud, but the one part that is a royal pain is the hub outlet. That part needs to be custom made to the car and would have to be hydroformed (due to the complex shape requirements) out of aluminum.

I really wish someone, forged performance, stillen, GTM etc, would just step up and come out with a good brake duct kit already. I'm pretty sure if it was priced right, it would sell a decent amount.