Car audio systems can cost you anywhere between 300 to 1000 bucks range depending on make and model. Fitting charges between 50 to 100 bucks at the most (no idea on fitting charges just a guess) You can get it fixed on Matar Qadeem they have a long line of car accessories and repair shops there. or even next to Sana round about. My choice would be Matar Qadeem if you are looking for quality work.