Many of the true luxury players will do offers during summer season such as stay 4 pay for 3 etc. You will probably also see many inclusions to make it attractive, such as spa inclusion, half board etc.
You will probably pay 350 to 450 USD / night in the better ones.
If your budget is lower, check places like Baros, W, Hilton, coco palm but dont forget to check out the really good ones for any offers; One and Only, Four seasons, Shangri La, the new Jumeirah resorts and Alila.