I have been trying for almost a year now to find anyplace at all that sells the book "Pasajeros a la Espanola 1492-1530" by Vilma Benzo de Ferrer, which was published in 2000 in Santo Domingo. You would think that a book published so recently would be readily available, and it is clear from finding references to it on many websites -- including this board -- that people have found a place to buy it. But I cannot find anywhere on the internet that it is actually available for purchase.
The company Libros Latinos does advertise a copy, but when I ordered it from them in June 2011, they said that they do not actually have a copy and were unable to find a copy to sell to me. This was the only website that advertised it for sale.