I know a lot of folks have wanted one of these and most places are out of stock. Vance Outdoors has them in stock for $429 plus shipping.
http://www.vanceoutdoors.com/products2.cfm/ID/115177/name/smith-and-wesson-mp9-shield-9mm-3-18-bbl
http://www.vanceoutdoors.com/products2.cfm/ID/115177/name/smith-and-wesson-mp9-shield-9mm-3-18-bbl