Consumer depth sensing cameras?

Are there such things as consumer cameras that take photos with depth maps? If not, why not? I know the Kinect does something similar at a price point that consumers can afford. Being able to use a depth map in conjunction with a photo would make separating your subject from background in an application like photoshop take moments. Being able to do the same with video would be incredible. This might be an area where a hardware startup could create something incredible.