From their website, the Submariner is not listed. The following Rolex products are offered along with prices (Dirhams/US$):
Rolex Oyster Turnograph steel bracelet 23,330.00 6,480.55
Rolex Oyster Professional from 26,280.00 7,300.00
Rolex Lady Oyster Perpetual from 21,550.00 5,986.11
Rolex Oyster Perpetual from 17,770.00 4,936.11
In my experience Dubai Duty Free is not good value for anything, despite its reputation.