You will get best Graphics Card under Rs 15000 – 20000 in India. You can choose any of them and then buy your best and simple Graphics Card under Rs 15000 – 20000.
These Graphics Card are available on popular E-commerce sites like Amazon, Flipkart etc. So You don’t need to go to a local retail store.
However, I will suggest you go to near retailer what if they are selling at low cost then you can save your little amount of money. Now, brands are competing with latest specifications and they sell their Graphics Card exclusive on e-commerce sites.
But if you know someone where you can get these Graphics Card offline then try to bargain as well.