Below is list of few reliable and highly recommended Indian domain registrars. These company are old, very professional and price is also very good. Their support is very good.
These Indian domain registrar accept payment in INR currency and in USD. Another good thing about them is that they have both offline and online payment options for Indian buyers.
Online Mode of Payment: Credit Card, Debit Card, Online Bank transfer
Offline Mode of Payment: Check, Draft, Cash deposit in Bank account.