1. Do we get 10% off on SawStop stuff at Klingspores?
No, power tools are generally not included in the discount program. I hear the standard fence on the SS contractor saw isn't that great, so figure that into the price.
2. What would it cost to do the wiring for 220V? I have a box in my shop with room for more breakers.
Not too much, depending on accessibility and how much you can do yourself. If you can run the wire from the panel to your outlet, then you only need an electrician to open a knock-out, put in the breaker and wire things up. That's less than an hour work. If you have open studs in the garage, running the romex is easy enough. Conduit is a little more work. I'd figure $50 in material and perhaps $100 in labor. That's on the upper end of things. If you find a friend that's handy, that works too. Plus, once you have 220V, all sorts of other opportunities open up as far as equipment goes.
3. How easy would it be to move one of the Grizzlys around with a mobile base?
Define "easy". I don't think moving a Grizzly cabinet saw around is any more difficult (or easier) than any other full size contractor saw if you have a good mobile base. The tricky part is doing this with a side/ outfeed table.