I've had my BGE for about 3 years now. I absolutely love it. I've cooked all the standards like steak, burgers, pork chops, etc. Have also cooked things like spare ribs, pizzas, whole chicken, whole turkey, etc.
I cannot recommend this grill enough. It's almost impossible to screw up anything you cook. You can sear a steak at 700 degrees and then bring temp down to finish it off, or as said above, you can cook ribs for 6 hours at 250 degrees.
I got mine as a Christmas gift from my in-laws so I can't say exactly how much they paid, but I think the large size (which is what I have) goes for around $750-800 plus more if you get any extras.
Word of advice is don't buy every little gadget that comes with it or that people try to sell you. You can spend a good chunk of change if you aren't careful by buying all the little gadgets. I personally use the BGE lump coal, but from what I've been told by others, any type of lump coal should work just fine.
There are 2 places to get one in the Jackson metro area that I'm aware of. I would recommend Madison Fireplace and Patio, which is right by the main entrance into Madison Central. I'm good friends with the owners and they will shoot you straight.