There is an 'all things Apple' shop in Mirdiff City Centre just across from Cite des Enfants - I think it is called I-style? They had the ones that strap around your upper arm. I think they also have the same shop in Dubai Mall.
Haha thanks its a present for my sister, I have a newborn and a crazy toddler so looking for a heads up before I leave home on this mission ;) should I choose to accept it :)