There is a website called https://freecharge.in.
Frankly speaking it is neither good nor bad in the sense there is promocode or discount code for the banks, but sometimes this promo code for some banks does not work.
For eg there is a 30% cash back to all the kotak bank customers and one has to enter the promo code but in my case it did not work.
Apart, from this there is coupons either free or at some meager price of Rs 5, Rs 10 and so on in the form of Mc Donalds, Jabong and Mynta for shopping, Dinning and movies. Here one can encounter their discount coupon codes through their payment counters and it goes very well with mc Donalds where one can get Large Fries or Mc Veggie completely free on the purchase of Rs 100/-.
This coupons are send to your registered mails with freecharge and can be discounted by taking the print out or providing the discounted code.