"Creamy chunks of nougat, shimmering pink squares of coconut ice, fat, honey-colored toffees; hundreds of different kinds of chocolate in neat rows; there was a large barrel of Every Flavor Beans, and another of Fizzing Whizbees, the levitating sherbert balls that Ron had mentioned; along yet another wall were "Special Effects" sweets: Droobles Best Blowing Gum (which filled a room with bluebell-colored bubbles that refused to pop for days), the strange, splintery Toothflossing Stringmints, tiny black Pepper Imps ('breathe fire for your friends!'), Ice Mice ('hear your teeth chatter and squeak!'), peppermint creams shaped like toads ('hop realistically in the stomach!') fragile sugar-spun quills, and exploding bonbons" (Prisoner of Azkaban 197).
As I brought up in my last entry, according to Ms. Rowling's grammar, levitating sherbert balls are in fact the same thing as Fizzing Whizbees (and yes, in the book, it is spelled s-h-e-r-b-e-R-t). The Honeydukes shop (at Universal Orlando) disagrees, and Dinah Bucholz includes a recipe for Sherbert Balls in The Unofficial Harry Potter Cookbook.
Normally, this would mean that we would make some Sherbert Balls. Unfortunately, Ms. Bucholz' recipe includes citric acid, which I have only been able to find online, and I really have no other need for it other than this recipe. And since I am a poor starving artist, I won't be spending my rent money on esoteric ingredients. The recipe does look like a lot of fun though, so if you feel like giving it a try, you should check out Dinah's book and make yourself some "Levitating" Sherbert Balls!