@ bionerd and @ dukhe:
I m pretty sure there is a library for students in ur university where there is a department called interloan library. U can get txtbooks or any other books for free. Interloan library loans book from other libraries to u at no cost. I think first check that out so that u don't have to worry abt buying or renting books. Coz I got all my txt books from interloan library and didn't pay a penny for my books. U sud seriously try this. :) Goodluck
Samikshya