Post Offices are normally open between 8am and 5 pm on Saturday through Thursday. 24-hour Postal Services are also available at the following Emarat Petrol stations in Dubai - Safa Park, Al Garhoud, Al Wasl Road and Al Diyafah Street. You can buy stamps and mail letters and parcels at these petrol stations. You can also, hire large PO Boxes for Dhs 200 per year and small PO Boxes for Dhs 150 per year.