There is a Forbidden Planet in the centre of Dublin. They are usually pretty reliable, although I don't remember being hugely impressed with the selection. They will have all the basic though
If you head towards Trinity/Grafton Street from O'Connell st and look left after you cross the river, it should be a block or two up.
If you head towards Trinity/Grafton Street from O'Connell st and look left after you cross the river, it should be a block or two up.