For great deals on all sorts of different things to do in the Orlando area try groupon dot com and choose Orlando as your city, you have to put in your email address which will result in them emailing you all sorts of interesting experiences at a very much reduced price.
Recent tickets I have bought have been for swimming with manatees in the Crystal River and swamp rides with Forever Florida, both less than half price.
Totally legit as far as I know and I've been using it for a while.

Do not expect major theme park tickets, this site is not for those, I've never seen them on there.