Ooo ... good question. That's on my to do list when I get down there. I get goosebumps just thinkin' about it.
For Cirque the discount is the child price, and it has to be purchased the day of. Its based on whatever is left, so sometimes you may not get to sit with the rest of your party. :-\ I lucked out because my roommate worked at Cirque, so I got to see it for free! And it is worth every penny you pay for it! ;D