My replies are being moderated so it's taking a bit time to show up. I always felt you have a lot of options and varieties in US compared to India. In India currently we are limited to the ones available with HD so you can safely assume we really don't have much options here. I've seen many people ordering from ebay and paying much more for customs and shipping.Welcome to the forum.
I think this is a difficult question since most people know stuff about only their own market. I think that you'd have to do some research and digging yourself on this one.
What kind of accessories are you interested in?
For example V&H exhaust is available in the USA but not in India. They are not even shipping it.
Vance & Hines Competition Series Slip-On Exhaust For Harley Street 2015 - RevZilla
I'm not sure what are the accessories that are worth it. I may have a better idea once I start riding and exploring the bike but I may not have someone who could bring it for me later:-(
I know it's difficult to answer as everyone's preferences vary but if you guys can point to some of the accessories that are kinda must have's, I can explore Not just the bike, riding gear or safety equipment or anything.