Here are the official images of Nendoroid Kurisu Makise (White Coat Ver.) from "Steins Gate" which is a Wonder Festival 2011 event limited item. An alternative way is to order via online from 7th Feb 2011 till 13th Feb 2011.
Release: During Wonder Festival 2011, or June 2011 of online orders, 3000yen
Source: Goodsmile.co.jp, Mikatan Blog