The burgers cost around $10, they do accept annual passholder discounts though, so it's about $8 when all is said and done. We got an order of fries too, because you can't have a burger with out fries right? Right! You can check out the menu prices if you are interested, it was around $13-14 when we were done paying for everything.
We sat down in front of Star Tours and watched the Fireworks at 9:30 PM while we ate our burger and fries from the Tomorrowland Terrace.