The big names in deep dish do sell them over the internet for delivery in CONUS. Its certainly expensive to order them that way, but we've done it occasionally as a treat.
Yeah, I used this image as a general idea of what’s going on underneath. Of course, you can also get entirely different toppings. Most of the time, I’ve found the sausage to be little balls with the rest of the meat.
For those who are unfamiliar with Chicago deep dish, the crust is thick, and the cheese and topping ingredients are underneath the sauce. That layer of sauce on the top is very thin.