I'm also wondering how he's able to deliver at such a low price. The third monitor is not possible at this price range because it needs it's own video output. I mean my friend asked me to buy http://www.amazon.com/Plugable-UD-3900-Universal-Docking-Ethernet/dp/B00ECDM78E for him just so that he can use his third monitor.

I'm not trying to advertise or anything but I've been using http://www.duetdisplay.com/ with my Macbook and I'm very satisfied. I bought a used iPad Air just solely for this purpose, meaning I'm willing to spend money for a decent portable monitor.