We were late to get a ticket but this is the cost of going up to the viewing deck.
It's not cheap at all and the queues can run long so you better plan this in advance. Cheaper for locals for sure. But I didn't really feel like spending so much on going up the viewing deck on this visit.
Do check their website for the latest prices and ticket availability. I've been up a couple of towers and my take is if you can't go all the way to the top its not worth it if it costs a lot!
But maybe I will change my opinion after visiting the Burj Khalifa!