The technical textbooks are so expensive. I'm glad I was in social science and could get most of my books very used :-) I think the technical ones have problems because they're not "real" books and only college students need them so there's a smaller number of people buying them but because they're technical, they have to cost more because the information is harder to produce. I hate the texts (like when I took accounting) that change every year or two and you have to buy the correct edition!