About 9.8m illicit cigarettes, branded Platinum Seven, were found with the assistance of detector dog, Toby.
Officials said it represented a loss of about €6.4m (£5.6m) to the Irish exchequer.
The seizure was made as part of an intelligence-led operation between Revenue Ireland officers and gardaí targeting the supply of illegal tobacco products.
Revenue Ireland said a man in his http://saladbiji.com/ 60s has been questioned and investigations were ongoing.