I get them from mouser, despite the high cost, i usually use a lot of capacitors for my restoration work, so i do a bulk order in most cases.
Here is the thread where i used FG/KZ in most places for my AU-X11 . The amp is for my personal use and i do not own a shop or do this as a profession.
http://audiokarma.org/forums/index.php?threads/sansui-au-x11-restoration.788908/
There are various reasons why i did not prefer to get them locally:
1. Authenticity (These days Chinese caps are made then put a Nichicon sticker on top of the cap and there is no way to know whether it is genuine.
2. Fake stuff floating in eBay, if you go through my thread you will realize how i was cheated with fake output transistors especially vintage ones
The only reputable source for spares has always been mouser/digikey/element14(they have panasonic)
I use Peak ATLAS ESR70 and DCA75 pro to get rid of stuff that is bad/or which i feel is not authentic.
AFAIK, i am not sure where in India these are available locally, but if you have any insight do let me know .