
theyre sold at a permanent window on the main walkway into/out from Adventureland, there's usually a decent line, and usually people on both sides of the path chowing down on yellow soft serve and floats. Kinda seems hard to miss for someone who is aware of them and on the lookout. Calling them elusive makes it sound like they are only sold at temporary food carts that rarely gets wheeled out and to random locations.
Seriously though I'm sorry you had such a hard time finding them and that CMs were so unhelpful - I'm just a little befuddled by it.