There was an observation made that the cost of an e-reader would cross below the cost of a single text book (I think the calculus math book is $60) and would replace all the books used by the student for 8 years. The math was pretty straight forward.
EDIT: I just looked up Prentice Hall's high school texts on Amazon [1] and they range from a couple in the $45 dollar range but most clustering around $100.
EDIT: I just looked up Prentice Hall's high school texts on Amazon [1] and they range from a couple in the $45 dollar range but most clustering around $100.
[1] http://www.amazon.com/s/ref=ntt_athr_dp_sr_1?_encoding=UTF8&...