Hi,
Just had the same problem myself, it's not that easy to find places that stock them, Ordering in something takes between 2-4 days, however, I was lucky and found the model I wanted in Virgin Mega Store, Mall of Emirates (
http://www.virginmegastore.me/index.aspx). Also Jumbo Electronics (
http://www.jumbocorp.com/), also in Mall of Emirates have a number of models in stock, and were prepared to order in the one I wanted. (Offered a massive 2% discount.......)
You can take the train/metro? to the Mall of Emirates stop and get a mall guide to find where the stores are. (Opposite ends of the mall)
Best of Luck