There are actually a few places. I just ordered mine at Garage Kwai in Arlington Heights. It was 2400 shipped for the clip. You can get them from a David at Touge Factory. He comes out to the 240 meets and owns his own business. Not sure what they cost.
Also, you could call Leo of JDM Spec Performance. He wants 2700. He's a nice guy. Check him out at
www.jdmspecperformance.com . Hope this was some kinda help.