I ordered one direct from VXDIAG for $129 shipped.Mine comes with wifi,vxidag gm without wifi is cheaper,10USD less. I already have Tech2Win setup and Saab GlobalTIS. With any luck this will work out and be a very inexpensive alternative to either a clone Tech2 at around $300 or the Mongoose at $480-$490.
So I tested the interface and Tech2win on a 2009 GMC Savannah full size van. I was able to connect, read engine data, read other modules data ( BCM ETC) with no issues.