Well, that's a long-ish story. Long story short: university textbooks are pricy.
Usually. We find the priceless ones (both literally and figuratively) from the
unknown corners of the internet, and here, in one place, you can find all of them
(that we've found so far). And if we can find no such textbook, we'll write
one for you folks. Just
mail us if you can't find a
textbook for some topic and we'll try our best to deliver.