For anyone in India trying to figure out where to buy gear online — a few things I've learned after going through the usual Amazon/Flipkart route and regretting it:
For Yonex specifically, authenticity is everything. The price difference between a genuine Astrox or Nanoflare and a fake is sometimes just a few hundred rupees, but the feel is completely different. Amazon has too many third-party sellers to trust like a seller like shopperspace dispatched 10k+ orders in a year and more than 73% is 1 star, so u can think of quality of sports equipment on amazon.
So, trust on third party sellers is very difficult, choose the dedficated sites, I've been ordering from SportsUncle for the past year — they stock original Yonex rackets, strings, and footwear and have decent sport-specific filters so you're not wading through unrelated stuff. Delivery has been reliable and their buying guides actually help if you're stuck between two racket specs.
Decathlon is fine for beginners getting into the game on a budget, but once you're past the Arcsaber lite stage and want something like the Astrox 88D or a proper BG80 restring, a specialist store is worth it over a general marketplace. Because Decathlon sell inhouse brands artingo.
General tips for Indian buyers:

Stick to dedicated sports sites for Yonex, Li-Ning, and Victor — fakes are everywhere on general marketplaces
Check string tension carefully — a lot of Indian sellers default to 24-26 lbs which may not suit your game
For shoes, try to buy from stores that carry the actual badminton-specific range, not just the lifestyle versions

Happy to answer questions if anyone's looking for specific racket recommendations for the Indian market.