Probably the best place to get Koni shock is tirerack.com
But you have a big drop at 2.25 inches those Koni's will never last. I had some with Progress springs witch are a 2.0 inch drop and they got worn out. they would not rebound after about 8 months, and I don't do any auto-cross or anything. The salesman at tire rack told me they are not a lowered shock, and if you put a lower spring on it you loose shock travel. You need a shock that is made for a lower spring. None of the ones mentioned, Koni, KYB, Tokico are a lowered shock.