I've given up on buying paper books. My PB360 is just too too handy!
However ...
... that doesn't count for my textbooks. Believe me you, I'd LOVE to have e-textbooks (I swear my Business Law textbook weighs ten pounds+ alone!). But, I don't keep my books when the class is done and there is no re-sale on an e-text. Until/unless they come up with a public-library-like way of borrowing e-texts, my cost advantage is to buy, then re-sell.
I don't really know how that can be fixed, either, although I have seen that some colleges are looking into making textbooks a part of the tuition cost (or loaning them out at the start of the semester and taking them back at the end). However, for now, paper textbooks it is for me.
Wow! I went off on a tangent, didn't I? Sorry. Must have been thoughts of the weight of my backpack!
Marilyn