Textbook is one of the biggest student expenses. Usually it will cost you hundreds of Ringgit. Below is where student in Malaysia can buy their text books at discount. Some of them might not be the latest edition. And some of them maybe handed from the senior student.

Places that you can get a bargain
http://forum.lowyat.net/index.php?showtopic=1119074&hl=
http://www.betterworldbooks.com/
http://www.bookdepository.co.uk/
http://www.mphonline.com/welcome/welcome.aspx

I prefer betterworld.com and I have bought about 10 books there. Cheap worldwide shipping. And the price is far cheaper than the Malaysia based seller