http://www.navytimes.com/article/20140223/NEWS04/302230006/Navy-develops-world-s-smallest-guided-missile- (http://www.navytimes.com/article/20140223/NEWS04/302230006/Navy-develops-world-s-smallest-guided-missile-)
"The missile measures 2 ½ inches in diameter and costs about $50,000 with off-the-shelf parts." ???