To pre-order the device, you will have to cough up AED 500 or $130 to get it delivered by august 2nd. Samsung is also offering a free microSD card with 128 GB capacity and also a slew of Galaxy app bonuses for the preordered units.
With the cat out of the bag, other carriers around the world and particularly in the united states are also expected to put the device up for preorders. T-Mobile might be the first one to put the device on pre order followed by other carriers.
But I would wait until the device is actually shown to the world. Usually, the period following the launch, will force the retailer to put up many exciting offers that includes much more than a microSD card. They include a gear VR headset. Premium headphones and even cold hard cash if you are a Samsung pay customer. One might even get the buy one get one free somewhere in the slew of offers
Stay tuned for more info