Welcome to Javaranch gautam! If your intention is to look for cheaper vouchers then no issues, and if you are looking for info, then I would suggest you can try your nearest prometric center, more specifically NIIT.
I am actually looking for discounted voucher. I know last month NIIT offered for Rs 4500 and now its RS 7200. Pl PM me if some one is interested in selling at discounted price.