http://www.paintshop.ie/Floor-Paint.aspx Based in Cork
http://www.aicpaints.ie/ Based in Dublin
http://www.candipaints.com/contact.htm Based in Dublin

I think any of the above would be able to supply decent epoxy paints.
I'd go for Tikkurila if it was me. Depending on paint mixed any ral color BS colour could probably be mixed.