I would suggest to buy this gold coin from Myntra(If your pincode is deliverable) -
https://www.myntra.com/gold-coin/c+...gandaberunda-24kt-gold-coin-5-gm/33439897/buy
Currently this coin gives the best value for money. Buy myntra gift cards from maximize.money and place order using them, since the cards cards you have won't give much rewards/cashback I would to go with UPI payment in Maximize website
Current price = 51170
- 4% off myntra coupon (This will be available at random times, please wait for some time if you don't see this coupon)
- 7.25% discount on Myntra gift cards in maximize
= 45600 for 5g
which is well below current market value
P.S. If you can get SBI cashback for purchase in maximise website you can get another 3% lower value. It generally takes around 10 days for delivery in myntra.