We have taxes on alcohol in northerly parts of Europe which means that our alcohol is expensive in comparison to USA. Also the $ exchange rate doesn't flatter the situation. Ireland has one of the highest alcohol taxes. Also the "Spar" price label indicates that it was in a local convenience store where you expect to pay rather over the odds for things.

Iceland and Norway have the highest alcohol taxes in Europe. For serious shock therapy, check out the price of things in Iceland at Vinbud, the state alcohol monopoly.
http://www.vinbud.is/DesktopDefault....egoryName=Bjor
A 470ml tin of American Budweiser is 194Kr. At 61Kr to the dollar, that's a little over $3. Actually, by the litre, that's cheaper than the Irish price.