Try Gaffar Market in Karol Bagh
You can try Gaffar market
Abd also Gameloot is a good option. You can buy secondhand games and you can also sell them to gameloot again.
Ghaffar Market is the best. Do compare the prices of various shops and then buy.
I'll suggest you to buy it from game shop only in Gaffar Market. Otherwise buy it online on Amazon. And don't buy from Nehru Place they sell fake game's.
Nehru place is also a good option to go for.
If you want you can go to markets like Ghaffar market and Lajpat Rai Mkt opposite Gaurishankar mandir .
Sargam electronics . They have all the games