see in this case, you really cant do much. But if you still wanna try something then get the exact part name and number and give call to spare parts dealer in shj selling same original parts at 50% discount rates. Usually they buy discounted parts in wholesale from dealer and sell with lil margin, you might get lucky if some dealer has this part in his stock.
Call these shops, find there number from google or yellow pages: Divya, Dhanya, Majelan, hammadi / hamadi, Ayash.
If cant get there numbers, drive to sharjah bmw road and they all have shops there, thats wht i do when i have to buy some spare parts.