@ Ankit: thanks. I found the cost of SCJP. Its $180 (after 40% discount from SAI. The actual cost was $300).
@Sandy Ghosh:
1. You need to enroll to SAI program.
webpage. Yo just need to send your full name, your university/Institution name (Your university/Institution should be a member of SAI institute) and country name to
Contact_SAI@sun.com.
2. Once you are registered with the SAI, send the same information to
Contact_SAI@sun.com. They will also need some documents which verifies that you are a current member of University/Institute. (Like photo ID).