Check out http://www.celticwhiskeyshop.com/
They have a shop in the city centre on Nassau Street adjacent to Grafton Street.
Also Locke's 8yo € 36.99 is a nice peated single malt worth trying.
Powers 12yo € 35.99 is not liked by all and very much an Irish whiskey
but Redbreast 12 € 37.49 or Greenspot € 38.99 are probably your best bet all right.
Generally these would be around 35.00 in other off licences and supermarkets but as the above is a whiskey specialist and has a bigger selection he charges slightly more.