Alcohol, cigarettes and other items were seized in the raids which also saw officers swoop on premises in Kildare, Mayo and Roscommon.
The alcohol seized was worth more than €27,000 while the cigarettes were worth more than €300,000.
It is understood that more than €30,000 in cash was also recovered.
All the alcohol and cigarettes were to be released onto the Christmas markets.
A number of people are being questioned and files are being prepared for prosecution.
A spokesman for the Revenue Commissioners said the operation had followed investigations and co-operation between Revenue and An Garda Síochána.