so you spent 800 dollars on books that you didnt even need? :S confusion.
Yes. I bought all my books at the beginning of last year

Sometimes the books I didn't use much for good for reference or good for when the lecturer pointed out to read a certain section for extending knowledge of the lecture slides.
Actually, $100 worth from the textbook buying of $800 was a software package and I actually am finding that Im using it quite a lot, especially for Engineering (and right now, Linear Algebra).
Do we really need to buy all prescribed texts? Are we able to borrow them from the library? Maybe photocopying selected chapters would be cheaper...
No you don't need to buy all prescribed texts. And yes you are able to borrow them for the library - but if the demand for a certain book is high, then you may be only be able to borrow that book for maybe 2 hours so in that case it would be useful to have your own copy.
Yes, photocopying is cheaper but you can only photocopy 10% of a book (I think). Beyond 10% and you are breaking copyright laws (this reminds me of the Biology teacher I had in Year 12 who photocopied the whole Biology Leading Edge book and gave out copies to everyone in my class...LOL)