The Easons on O'Connell Street has about a shelf and a half of Star Trek books. They keep it updated too, it was the first place I saw Fearful Symmetry. Hodges Fidges, Waterstones and Chapters have a selection too. And then of course there's Forbidden Planet. However, it is annoying to have to trek into town to pick up a book. The only other option is Borders in Blanchardstown but that too is a journey in itself. I'm hoping that the trend may change, once the new film is released, like it did with Star Wars.