There are always used books available on the island, though selection and price will vary at times. Once you are here and get to know some folks you can often borrow certain books.

As far as ordering goes, I would personally order them as early as you can (no more than a semester in advance) since there are sometimes issues with back orders and late delivery. If they are sent to the school, they will be put away to wait for your arrival.

Also make sure that you follow the required/recommended booklist sent out by the school and not the one on the website since it seems to be updated in a haphazard manner.

Best of Luck !