I've searched for a real book store as well and never found one. Depending upon what you are looking for, go to any bar that sailors frequent (e.g. Lagoonies or the St. Martin Yacht Club) and they'll have a bookshelf with books. The idea is put one in and take one out. Although a couple of years back I brought in 2 cases of books (I'd switched to a Kindle and e-books) and put them into the bookshelf. The next day I was back and saw that most of them had been taken and not replaced... So much for the sailor's honor system...