I know you can get the good stuff at MGM, on the way to tower of terror on the left hand side of the street. I think there is a french fry place beside it and a fruit stand in front of the place.
We bought it from a cart in the MK. The cart was located somewhere between Pecos Bills and Splash Mountain Sorry I can't be more specific. That is about all I can remember - it was very hot that day and I just remember the refreshing treat!!
When we were at the MK last September, we bought the frozen lemonade in the toontown area. The shop is called Mickey's Toontown Farmers Market and they sell it for $3.29.
At DHS just outside of the Motors....stunt show they sell them with raspberry and also frozen cokes. My kids love them while we are waiting in the stands. Especially when it's hot!!
I was on a quest to find the frozen lemonade slush on my first day at the MK but I could only find the minute maid stuff which was still good. I found the plain lemonade slush at Enchanted Grove at MK and allearsnet says they have rasberry lemonade slush. The stuff is so refreshing on a hot day.
ok I think I have all the locations narrowed down - but still haven't found any place in Epcot that has the frozen lemonade (the good stuff not the minute maid prepackaged stuff)