Hey Manupriyam,
First rule of buying alloys -
1. Never buy from the dealer unless you like wasting money! (only exception would be if you could squeeze them so much as to give you a discount via the alloys... but check prices elsewhere to compare)
lol, I have PMd you a contact number of a tyre shop in bombay, give them a call and check for pricing. Also try to go over an speak to them about the right choice of wheels and tires... they are incredibly knowledgable and trustworthy. However, they only stock indian alloys, which you seem to be looking at anyway....
Also, take a look at this thread if you need help deciing on indian vs imported rims -
http://www.team-bhp.com/forum/showthread.php?t=3167 (Indian vs Imported Rims.....which ones?)
cya
R