If you want to save on initial costs, you could buy Indian editions, rather than English editions. The quality is not as good so they won't last you as long, but they will keep your initial costs down. The downside is that once you graduate college, you may have to purchase the books all over again.
You could also try the special student packages that
www.abcbookco.com put together. Also, I think the Hale Clinic give 10 per cent. discount on books to students.
You could also check with Stuart at Minerva to see if he has any deals going.
Best of luck in your studies.