I’m not sure where to look in Mumbai, but in the United States you can earn up to $1000/week.
Check out this thread for a couple of US web sites. Maybe they could point you in the right direction:
http://www.medhelp.org/posts/Hepatitis-B/Hep-B-Patients-Can-Earn-Money-by-Donating-Plasma/show/96873
I actually looked into this but was disqualified because I am positive for HCV antibodies. I sure could have used the extra money too. Also, I am not sure but you may have to be in the acute stages to qualify.