I think they serve it pretty much everywhere. I had 2. 1 at Coral Reef (SOOOOOOOO Good Made Perfectly) and the other at Le Cellier (I couldn't even finish it). When made right they are excellent!
I had one in January at Whispering Canyon. I recall having them previously at Rose and Crown, Kona, and Tambu Lounge. They are very yummy, but I swear I'm getting them solely for the benefit of my child. He loves to keep the glowing ice cube. He has quite a collection now.
Just an FYI from someone who's made a LOT of drinks in her life...Sweet & Sour mix and Margarita Mix are 2 completely different entities with different flavors. They taste nothing alike and if it calls for Sweet & Sour mix, don't use Margarita mix. It'll make it taste differently.