There are some notable vendors for audio/visual equipment in Dubai. It is a really great place, but, a little like the wild West. Good gear and experienced technicians run out fast. Plan ahead and talk to these people before you head to the Middle East.
Protec
PO Box 71215, Dubai, United Arab Emirates
+971 4 3473788
http://www.productiontec.com/
Great vendor for gear and labor support
Gearhouse
Post Box : 53407 Dubai Investment Park, Dubai, UAE.
+971 (4) 8850541
http://www.gearhouse-arabia.com/video.html
Delta Sound FZ-LLC
Office 96 2nd Floor DMC Building 2
Dubai Media city
PO Box 72280, Dubai UAE
+971 50 640 3288
http://www.deltasound.co.uk/dubai/