I had Springy freeze-marked last week, the price was £47 but there were 4 of us so you do get a discount. I would think they would do the micromark in Ireland if they do nomal freezemarking.
You could try http://www.padlock-ireland.com/index.asp they freezebrand in the South of Ireland, and since so many stolen horses up here end up over the border it may be a good idea.