For the most part, I would classify the "required" books as "highly recommeneded". Nobody is going to walk down the aisle to see if you bought the book. Few professors actually assign reading in the textbooks (Physio, Genetics and Micro being the only things I can recall at the moment).

Everything gets pretty much sold or given away by the time you leave. There was a rash of folks about three semesters ago who left the island without selling their cars (most were sold by friends during the next semester).

Books are usually fairly easy to get on the island from one semester to the next. After first semester (when I brought down all the "required" and "recommended" books plus some others), I would keep my eye out during the semester for next semester's books. Those I just couldn't find, I would pick up when I went home at break (or have someone send one to me).

As for Amazon, they don't ship to Saba (or the Netheralands Antilles). I would have books and other things shipped to my stateside mailing service and they would get to Saba within 2 to 4 weeks.

Best of Luck!