Hey there,
Great to find a fellow builder in India.
I have found eBay.in, diy-India.com, makemendel.com, 3dprintronics.com, aliexpress.com have all the things on offer.
Indian hotends/nozzles, bearings etc are expensive. Best buy those from aliexpress.com, but it takes a 20 days to get delivered. Also make sure that the delivery is through China Registered Air Mail only. I haven't received my parts when they use other services.
Smooth rods, threaded rods and heavier items are best ordered from India.
Also, why did you decide on the H-Bot, it has a few limitations. I am also looking at a HBot/COREXY build. PM me and I will share my number. May be we can discuss it.