If you are a first time buyer in new project then you can buy it. If you have to rent one in a old society then you have to check if any of the residents are ready to rent their parking space. Builders charge very high for extra parking lots. When I bought second parking place for my second car, I had to pay Rs 4 lakh.. the demand was high during that time in my project.. now it is available for around 3 lakh.