The Sonostreamer is an opensource hardware and software platform designed as an inexpensive way to stream the video output of an ultrasound machine over the internet. The sourcecode can be found publicly posted on GitHub (click the little devil dude at the top of the page), and anyone is welcome to make their own box, free of payment or royalties.
If, on the other hand, you would rather save yourself the trouble and buy a pre-built box, keep an eye on this page or click the subscription link at the bottom of the page to be the first to know when they become available for purchase!